{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47379", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.811Z", "datePublished": "2024-05-21T15:03:41.677Z", "dateUpdated": "2026-05-11T13:53:33.146Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:53:33.146Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\n\nKASAN reports a use-after-free report when doing fuzz test:\n\n[693354.104835] ==================================================================\n[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338\n\n[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147\n[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018\n[693354.105612] Call Trace:\n[693354.105621] dump_stack+0xf1/0x19b\n[693354.105626] ? show_regs_print_info+0x5/0x5\n[693354.105634] ? printk+0x9c/0xc3\n[693354.105638] ? cpumask_weight+0x1f/0x1f\n[693354.105648] print_address_description+0x70/0x360\n[693354.105654] kasan_report+0x1b2/0x330\n[693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105670] bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105675] ? bfq_cpd_init+0x20/0x20\n[693354.105683] cgroup_file_write+0x3aa/0x510\n[693354.105693] ? ___slab_alloc+0x507/0x540\n[693354.105698] ? cgroup_file_poll+0x60/0x60\n[693354.105702] ? 0xffffffff89600000\n[693354.105708] ? usercopy_abort+0x90/0x90\n[693354.105716] ? mutex_lock+0xef/0x180\n[693354.105726] kernfs_fop_write+0x1ab/0x280\n[693354.105732] ? cgroup_file_poll+0x60/0x60\n[693354.105738] vfs_write+0xe7/0x230\n[693354.105744] ksys_write+0xb0/0x140\n[693354.105749] ? __ia32_sys_read+0x50/0x50\n[693354.105760] do_syscall_64+0x112/0x370\n[693354.105766] ? syscall_return_slowpath+0x260/0x260\n[693354.105772] ? do_page_fault+0x9b/0x270\n[693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0\n[693354.105784] ? enter_from_user_mode+0x30/0x30\n[693354.105793] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.105875] Allocated by task 1453337:\n[693354.106001] kasan_kmalloc+0xa0/0xd0\n[693354.106006] kmem_cache_alloc_node_trace+0x108/0x220\n[693354.106010] bfq_pd_alloc+0x96/0x120\n[693354.106015] blkcg_activate_policy+0x1b7/0x2b0\n[693354.106020] bfq_create_group_hierarchy+0x1e/0x80\n[693354.106026] bfq_init_queue+0x678/0x8c0\n[693354.106031] blk_mq_init_sched+0x1f8/0x460\n[693354.106037] elevator_switch_mq+0xe1/0x240\n[693354.106041] elevator_switch+0x25/0x40\n[693354.106045] elv_iosched_store+0x1a1/0x230\n[693354.106049] queue_attr_store+0x78/0xb0\n[693354.106053] kernfs_fop_write+0x1ab/0x280\n[693354.106056] vfs_write+0xe7/0x230\n[693354.106060] ksys_write+0xb0/0x140\n[693354.106064] do_syscall_64+0x112/0x370\n[693354.106069] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106114] Freed by task 1453336:\n[693354.106225] __kasan_slab_free+0x130/0x180\n[693354.106229] kfree+0x90/0x1b0\n[693354.106233] blkcg_deactivate_policy+0x12c/0x220\n[693354.106238] bfq_exit_queue+0xf5/0x110\n[693354.106241] blk_mq_exit_sched+0x104/0x130\n[693354.106245] __elevator_exit+0x45/0x60\n[693354.106249] elevator_switch_mq+0xd6/0x240\n[693354.106253] elevator_switch+0x25/0x40\n[693354.106257] elv_iosched_store+0x1a1/0x230\n[693354.106261] queue_attr_store+0x78/0xb0\n[693354.106264] kernfs_fop_write+0x1ab/0x280\n[693354.106268] vfs_write+0xe7/0x230\n[693354.106271] ksys_write+0xb0/0x140\n[693354.106275] do_syscall_64+0x112/0x370\n[693354.106280] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106329] The buggy address belongs to the object at ffff888be0a35580\n which belongs to the cache kmalloc-1k of size 1024\n[693354.106736] The buggy address is located 228 bytes inside of\n 1024-byte region [ffff888be0a35580, ffff888be0a35980)\n[693354.107114] The buggy address belongs to the page:\n[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0\n[693354.107606] flags: 0x17ffffc0008100(slab|head)\n[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080\n[693354.108020] r\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/blk-cgroup.c"], "versions": [{"version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08", "status": "affected", "versionType": "git"}, {"version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "f58d305887ad7b24986d58e881f6806bb81b2bdf", "status": "affected", "versionType": "git"}, {"version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "7c2c69e010431b0157c9454adcdd2305809bf9fb", "status": "affected", "versionType": "git"}, {"version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "858560b27645e7e97aca37ee8f232cccd658fbd2", "status": "affected", "versionType": "git"}, {"version": "9d5e2d69705fed4ab527f5a283b90ae602f4e0fd", "status": "affected", "versionType": "git"}, {"version": "3ca6e949b751fa3dfbf475ce635364cef543738b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/blk-cgroup.c"], "versions": [{"version": "4.17", "status": "affected"}, {"version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.150", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.70", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.9", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.4.150"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.10.70"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.14.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"}, {"url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"}, {"url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb"}, {"url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"}], "title": "blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-11T18:56:11.466478Z", "id": "CVE-2021-47379", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-11T18:56:25.435Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.606Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.606Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47379", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-11T18:56:11.466478Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-11T18:56:18.935Z"}}], "cna": {"title": "blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08", "versionType": "git"}, {"status": "affected", "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "f58d305887ad7b24986d58e881f6806bb81b2bdf", "versionType": "git"}, {"status": "affected", "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "7c2c69e010431b0157c9454adcdd2305809bf9fb", "versionType": "git"}, {"status": "affected", "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801", "lessThan": "858560b27645e7e97aca37ee8f232cccd658fbd2", "versionType": "git"}, {"status": "affected", "version": "9d5e2d69705fed4ab527f5a283b90ae602f4e0fd", "versionType": "git"}, {"status": "affected", "version": "3ca6e949b751fa3dfbf475ce635364cef543738b", "versionType": "git"}], "programFiles": ["block/blk-cgroup.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"status": "unaffected", "version": "0", "lessThan": "4.17", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.150", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.70", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.14.9", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["block/blk-cgroup.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"}, {"url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"}, {"url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb"}, {"url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\n\nKASAN reports a use-after-free report when doing fuzz test:\n\n[693354.104835] ==================================================================\n[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338\n\n[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147\n[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018\n[693354.105612] Call Trace:\n[693354.105621] dump_stack+0xf1/0x19b\n[693354.105626] ? show_regs_print_info+0x5/0x5\n[693354.105634] ? printk+0x9c/0xc3\n[693354.105638] ? cpumask_weight+0x1f/0x1f\n[693354.105648] print_address_description+0x70/0x360\n[693354.105654] kasan_report+0x1b2/0x330\n[693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105670] bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105675] ? bfq_cpd_init+0x20/0x20\n[693354.105683] cgroup_file_write+0x3aa/0x510\n[693354.105693] ? ___slab_alloc+0x507/0x540\n[693354.105698] ? cgroup_file_poll+0x60/0x60\n[693354.105702] ? 0xffffffff89600000\n[693354.105708] ? usercopy_abort+0x90/0x90\n[693354.105716] ? mutex_lock+0xef/0x180\n[693354.105726] kernfs_fop_write+0x1ab/0x280\n[693354.105732] ? cgroup_file_poll+0x60/0x60\n[693354.105738] vfs_write+0xe7/0x230\n[693354.105744] ksys_write+0xb0/0x140\n[693354.105749] ? __ia32_sys_read+0x50/0x50\n[693354.105760] do_syscall_64+0x112/0x370\n[693354.105766] ? syscall_return_slowpath+0x260/0x260\n[693354.105772] ? do_page_fault+0x9b/0x270\n[693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0\n[693354.105784] ? enter_from_user_mode+0x30/0x30\n[693354.105793] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.105875] Allocated by task 1453337:\n[693354.106001] kasan_kmalloc+0xa0/0xd0\n[693354.106006] kmem_cache_alloc_node_trace+0x108/0x220\n[693354.106010] bfq_pd_alloc+0x96/0x120\n[693354.106015] blkcg_activate_policy+0x1b7/0x2b0\n[693354.106020] bfq_create_group_hierarchy+0x1e/0x80\n[693354.106026] bfq_init_queue+0x678/0x8c0\n[693354.106031] blk_mq_init_sched+0x1f8/0x460\n[693354.106037] elevator_switch_mq+0xe1/0x240\n[693354.106041] elevator_switch+0x25/0x40\n[693354.106045] elv_iosched_store+0x1a1/0x230\n[693354.106049] queue_attr_store+0x78/0xb0\n[693354.106053] kernfs_fop_write+0x1ab/0x280\n[693354.106056] vfs_write+0xe7/0x230\n[693354.106060] ksys_write+0xb0/0x140\n[693354.106064] do_syscall_64+0x112/0x370\n[693354.106069] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106114] Freed by task 1453336:\n[693354.106225] __kasan_slab_free+0x130/0x180\n[693354.106229] kfree+0x90/0x1b0\n[693354.106233] blkcg_deactivate_policy+0x12c/0x220\n[693354.106238] bfq_exit_queue+0xf5/0x110\n[693354.106241] blk_mq_exit_sched+0x104/0x130\n[693354.106245] __elevator_exit+0x45/0x60\n[693354.106249] elevator_switch_mq+0xd6/0x240\n[693354.106253] elevator_switch+0x25/0x40\n[693354.106257] elv_iosched_store+0x1a1/0x230\n[693354.106261] queue_attr_store+0x78/0xb0\n[693354.106264] kernfs_fop_write+0x1ab/0x280\n[693354.106268] vfs_write+0xe7/0x230\n[693354.106271] ksys_write+0xb0/0x140\n[693354.106275] do_syscall_64+0x112/0x370\n[693354.106280] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106329] The buggy address belongs to the object at ffff888be0a35580\n which belongs to the cache kmalloc-1k of size 1024\n[693354.106736] The buggy address is located 228 bytes inside of\n 1024-byte region [ffff888be0a35580, ffff888be0a35980)\n[693354.107114] The buggy address belongs to the page:\n[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0\n[693354.107606] flags: 0x17ffffc0008100(slab|head)\n[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080\n[693354.108020] r\n---truncated---"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.150", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.70", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.9", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.14.51"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.16.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-21T08:31:45.980Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47379", "state": "PUBLISHED", "dateUpdated": "2025-05-21T08:31:45.980Z", "dateReserved": "2024-05-21T14:58:30.811Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:03:41.677Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F6EBA6BC-0594-4920-B410-5DDA60229E8E", "versionEndExcluding": "5.4.150", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A2A50090-4483-4F44-9147-BF0B012FBF7E", "versionEndExcluding": "5.10.70", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1B31D6C1-A751-438D-906B-0C56B789D498", "versionEndExcluding": "5.14.9", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\n\nKASAN reports a use-after-free report when doing fuzz test:\n\n[693354.104835] ==================================================================\n[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338\n\n[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147\n[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018\n[693354.105612] Call Trace:\n[693354.105621] dump_stack+0xf1/0x19b\n[693354.105626] ? show_regs_print_info+0x5/0x5\n[693354.105634] ? printk+0x9c/0xc3\n[693354.105638] ? cpumask_weight+0x1f/0x1f\n[693354.105648] print_address_description+0x70/0x360\n[693354.105654] kasan_report+0x1b2/0x330\n[693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105670] bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105675] ? bfq_cpd_init+0x20/0x20\n[693354.105683] cgroup_file_write+0x3aa/0x510\n[693354.105693] ? ___slab_alloc+0x507/0x540\n[693354.105698] ? cgroup_file_poll+0x60/0x60\n[693354.105702] ? 0xffffffff89600000\n[693354.105708] ? usercopy_abort+0x90/0x90\n[693354.105716] ? mutex_lock+0xef/0x180\n[693354.105726] kernfs_fop_write+0x1ab/0x280\n[693354.105732] ? cgroup_file_poll+0x60/0x60\n[693354.105738] vfs_write+0xe7/0x230\n[693354.105744] ksys_write+0xb0/0x140\n[693354.105749] ? __ia32_sys_read+0x50/0x50\n[693354.105760] do_syscall_64+0x112/0x370\n[693354.105766] ? syscall_return_slowpath+0x260/0x260\n[693354.105772] ? do_page_fault+0x9b/0x270\n[693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0\n[693354.105784] ? enter_from_user_mode+0x30/0x30\n[693354.105793] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.105875] Allocated by task 1453337:\n[693354.106001] kasan_kmalloc+0xa0/0xd0\n[693354.106006] kmem_cache_alloc_node_trace+0x108/0x220\n[693354.106010] bfq_pd_alloc+0x96/0x120\n[693354.106015] blkcg_activate_policy+0x1b7/0x2b0\n[693354.106020] bfq_create_group_hierarchy+0x1e/0x80\n[693354.106026] bfq_init_queue+0x678/0x8c0\n[693354.106031] blk_mq_init_sched+0x1f8/0x460\n[693354.106037] elevator_switch_mq+0xe1/0x240\n[693354.106041] elevator_switch+0x25/0x40\n[693354.106045] elv_iosched_store+0x1a1/0x230\n[693354.106049] queue_attr_store+0x78/0xb0\n[693354.106053] kernfs_fop_write+0x1ab/0x280\n[693354.106056] vfs_write+0xe7/0x230\n[693354.106060] ksys_write+0xb0/0x140\n[693354.106064] do_syscall_64+0x112/0x370\n[693354.106069] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106114] Freed by task 1453336:\n[693354.106225] __kasan_slab_free+0x130/0x180\n[693354.106229] kfree+0x90/0x1b0\n[693354.106233] blkcg_deactivate_policy+0x12c/0x220\n[693354.106238] bfq_exit_queue+0xf5/0x110\n[693354.106241] blk_mq_exit_sched+0x104/0x130\n[693354.106245] __elevator_exit+0x45/0x60\n[693354.106249] elevator_switch_mq+0xd6/0x240\n[693354.106253] elevator_switch+0x25/0x40\n[693354.106257] elv_iosched_store+0x1a1/0x230\n[693354.106261] queue_attr_store+0x78/0xb0\n[693354.106264] kernfs_fop_write+0x1ab/0x280\n[693354.106268] vfs_write+0xe7/0x230\n[693354.106271] ksys_write+0xb0/0x140\n[693354.106275] do_syscall_64+0x112/0x370\n[693354.106280] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106329] The buggy address belongs to the object at ffff888be0a35580\n which belongs to the cache kmalloc-1k of size 1024\n[693354.106736] The buggy address is located 228 bytes inside of\n 1024-byte region [ffff888be0a35580, ffff888be0a35980)\n[693354.107114] The buggy address belongs to the page:\n[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0\n[693354.107606] flags: 0x17ffffc0008100(slab|head)\n[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080\n[693354.108020] r\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: blk-cgroup: corrige UAF capturando el bloqueo de blkcg antes de destruir blkg pd KASAN informa un informe de use after free al realizar una prueba fuzz: [693354.104835] ======= ==================================================== ========= [693354.105094] ERROR: KASAN: use after free en bfq_io_set_weight_legacy+0xd3/0x160 [693354.105336] Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff888be0a35664 por tarea sh/1453338 [693354.10560 7] CPU: 41 PID: 1453338 Comm: sh Kdump: cargado No contaminado 4.18.0-147 [693354.105610] Nombre de hardware: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 02/07/2018 [693354.105612] Seguimiento de llamadas: [693354.105621] +0xf1/0x19b [693354.105626] ? show_regs_print_info+0x5/0x5 [693354.105634] ? imprimirk+0x9c/0xc3 [693354.105638] ? cpumask_weight+0x1f/0x1f [693354.105648] print_address_description+0x70/0x360 [693354.105654] kasan_report+0x1b2/0x330 [693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105670] bfq_io_set_weight_legacy+0xd3/0x160 [693354.105675] ? bfq_cpd_init+0x20/0x20 [693354.105683] cgroup_file_write+0x3aa/0x510 [693354.105693] ? ___slab_alloc+0x507/0x540 [693354.105698] ? cgroup_file_poll+0x60/0x60 [693354.105702] ? 0xffffffff89600000 [693354.105708] ? usercopy_abort+0x90/0x90 [693354.105716] ? mutex_lock+0xef/0x180 [693354.105726] kernfs_fop_write+0x1ab/0x280 [693354.105732] ? cgroup_file_poll+0x60/0x60 [693354.105738] vfs_write+0xe7/0x230 [693354.105744] ksys_write+0xb0/0x140 [693354.105749] ? __ia32_sys_read+0x50/0x50 [693354.105760] do_syscall_64+0x112/0x370 [693354.105766] ? syscall_return_slowpath+0x260/0x260 [693354.105772]? do_page_fault+0x9b/0x270 [693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0 [693354.105784] ? enter_from_user_mode+0x30/0x30 [693354.105793] Entry_SYSCALL_64_after_hwframe+0x65/0xca [693354.105875] Asignado por la tarea 1453337: [693354.106001] kasan_kmalloc+0xa0/0xd0 [693354. 106006] kmem_cache_alloc_node_trace+0x108/0x220 [693354.106010] bfq_pd_alloc+0x96/0x120 [693354.106015] blkcg_activate_policy+ 0x1b7/0x2b0 [693354.106020] bfq_create_group_hierarchy+0x1e/0x80 [693354.106026] bfq_init_queue+0x678/0x8c0 [693354.106031] blk_mq_init_sched+0x1f8/0x460 [693354.106037] elevator_switch_mq+0xe1/0x240 [693354.106041] elevator_switch+0x25/0x40 [693354.106045] elv_iosched_store+0x1a1/ 0x230 [693354.106049] queue_attr_store+0x78/0xb0 [693354.106053] kernfs_fop_write+0x1ab/0x280 [693354.106056] vfs_write+0xe7/0x230 [693354.106060] s_write+0xb0/0x140 [693354.106064] do_syscall_64+0x112/0x370 [693354.106069] Entry_SYSCALL_64_after_hwframe+0x65/0xca [ 693354.106114] Liberado por la tarea 1453336: [693354.106225] __kasan_slab_free+0x130/0x180 [693354.106229] kfree+0x90/0x1b0 [693354.106233] blkcg_deactivate_policy+0x12 c/0x220 [693354.106238] bfq_exit_queue+0xf5/0x110 [693354.106241] blk_mq_exit_sched+0x104/0x130 [693354.106245] __elevator_exit+0x45/0x60 [693354.106249] elevator_switch_mq+0xd6/0x240 [693354.106253] interruptor_elevador+0x25/0x40 [693354.106257] elv_iosched_store+0x1a1/0x230 .106261] queue_attr_store+0x78/0xb0 [693354.106264] kernfs_fop_write+0x1ab/0x280 [693354.106268] vfs_write+ 0xe7/0x230 [693354.106271] ksys_write+0xb0/0x140 [693354.106275] do_syscall_64+0x112/0x370 [693354.106280] Entry_SYSCALL_64_after_hwframe+0x65/0xca [69335 4.106329] La direcci\u00f3n con errores pertenece al objeto en ffff888be0a35580 que pertenece al cach\u00e9 kmalloc-1k de tama\u00f1o 1024 [693354.106736] La direcci\u00f3n con errores se encuentra a 228 bytes dentro de la regi\u00f3n de 1024 bytes [ffff888be0a35580, ffff888be0a35980) [693354.107114] La direcci\u00f3n con errores pertenece a la p\u00e1gina: [693354.107273] p\u00e1gina:ffffea002f828c00 1 recuento de mapas: 0 mapeo: ffff888107c17080 \u00edndice: 0x0 Compound_mapcount: 0 [693354.107606] banderas: 0x17ffffc0008100(slab|head) [693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080 3354.108020] r ---truncado---"}], "id": "CVE-2021-47379", "lastModified": "2024-12-23T20:47:30.867", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-05-21T15:15:23.590", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd", "id": "2282361", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282361"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\nKASAN reports a use-after-free report when doing fuzz test:\n[693354.104835] ==================================================================\n[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338\n[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147\n[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018\n[693354.105612] Call Trace:\n[693354.105621] dump_stack+0xf1/0x19b\n[693354.105626] ? show_regs_print_info+0x5/0x5\n[693354.105634] ? printk+0x9c/0xc3\n[693354.105638] ? cpumask_weight+0x1f/0x1f\n[693354.105648] print_address_description+0x70/0x360\n[693354.105654] kasan_report+0x1b2/0x330\n[693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105670] bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105675] ? bfq_cpd_init+0x20/0x20\n[693354.105683] cgroup_file_write+0x3aa/0x510\n[693354.105693] ? ___slab_alloc+0x507/0x540\n[693354.105698] ? cgroup_file_poll+0x60/0x60\n[693354.105702] ? 0xffffffff89600000\n[693354.105708] ? usercopy_abort+0x90/0x90\n[693354.105716] ? mutex_lock+0xef/0x180\n[693354.105726] kernfs_fop_write+0x1ab/0x280\n[693354.105732] ? cgroup_file_poll+0x60/0x60\n[693354.105738] vfs_write+0xe7/0x230\n[693354.105744] ksys_write+0xb0/0x140\n[693354.105749] ? __ia32_sys_read+0x50/0x50\n[693354.105760] do_syscall_64+0x112/0x370\n[693354.105766] ? syscall_return_slowpath+0x260/0x260\n[693354.105772] ? do_page_fault+0x9b/0x270\n[693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0\n[693354.105784] ? enter_from_user_mode+0x30/0x30\n[693354.105793] entry_SYSCALL_64_after_hwframe+0x65/0xca\n[693354.105875] Allocated by task 1453337:\n[693354.106001] kasan_kmalloc+0xa0/0xd0\n[693354.106006] kmem_cache_alloc_node_trace+0x108/0x220\n[693354.106010] bfq_pd_alloc+0x96/0x120\n[693354.106015] blkcg_activate_policy+0x1b7/0x2b0\n[693354.106020] bfq_create_group_hierarchy+0x1e/0x80\n[693354.106026] bfq_init_queue+0x678/0x8c0\n[693354.106031] blk_mq_init_sched+0x1f8/0x460\n[693354.106037] elevator_switch_mq+0xe1/0x240\n[693354.106041] elevator_switch+0x25/0x40\n[693354.106045] elv_iosched_store+0x1a1/0x230\n[693354.106049] queue_attr_store+0x78/0xb0\n[693354.106053] kernfs_fop_write+0x1ab/0x280\n[693354.106056] vfs_write+0xe7/0x230\n[693354.106060] ksys_write+0xb0/0x140\n[693354.106064] do_syscall_64+0x112/0x370\n[693354.106069] entry_SYSCALL_64_after_hwframe+0x65/0xca\n[693354.106114] Freed by task 1453336:\n[693354.106225] __kasan_slab_free+0x130/0x180\n[693354.106229] kfree+0x90/0x1b0\n[693354.106233] blkcg_deactivate_policy+0x12c/0x220\n[693354.106238] bfq_exit_queue+0xf5/0x110\n[693354.106241] blk_mq_exit_sched+0x104/0x130\n[693354.106245] __elevator_exit+0x45/0x60\n[693354.106249] elevator_switch_mq+0xd6/0x240\n[693354.106253] elevator_switch+0x25/0x40\n[693354.106257] elv_iosched_store+0x1a1/0x230\n[693354.106261] queue_attr_store+0x78/0xb0\n[693354.106264] kernfs_fop_write+0x1ab/0x280\n[693354.106268] vfs_write+0xe7/0x230\n[693354.106271] ksys_write+0xb0/0x140\n[693354.106275] do_syscall_64+0x112/0x370\n[693354.106280] entry_SYSCALL_64_after_hwframe+0x65/0xca\n[693354.106329] The buggy address belongs to the object at ffff888be0a35580\nwhich belongs to the cache kmalloc-1k of size 1024\n[693354.106736] The buggy address is located 228 bytes inside of\n1024-byte region [ffff888be0a35580, ffff888be0a35980)\n[693354.107114] The buggy address belongs to the page:\n[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0\n[693354.107606] flags: 0x17ffffc0008100(slab|head)\n[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080\n[693354.108020] r\n---truncated---"], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47379", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47379\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47379\nhttps://lore.kernel.org/linux-cve-announce/2024052142-CVE-2021-47379-58ec@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because it can lead to crashes due to invalid memory access, it does not directly compromise data confidentiality or integrity.", "threat_severity": "Moderate"}

{}