{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-52446", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.291Z", "datePublished": "2024-02-22T16:21:38.408Z", "dateUpdated": "2026-05-11T19:27:29.463Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:27:29.463Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n [ 1887.186498]\n [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494\n [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n [ 1887.190341] Call Trace:\n [ 1887.190666] <TASK>\n [ 1887.190949] dump_stack_lvl+0xac/0xe0\n [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0\n [ 1887.192019] ? panic+0x3c0/0x3c0\n [ 1887.192449] print_report+0x14f/0x720\n [ 1887.192930] ? preempt_count_sub+0x1c/0xd0\n [ 1887.193459] ? __virt_addr_valid+0xac/0x120\n [ 1887.194004] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.194572] kasan_report+0xc3/0x100\n [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0\n [ 1887.196736] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197270] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197802] ? _raw_spin_unlock+0x1f/0x40\n [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260\n [ 1887.198883] array_map_free+0x1a3/0x260\n [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0\n [ 1887.199943] process_scheduled_works+0x3a2/0x6c0\n [ 1887.200549] worker_thread+0x633/0x890\n [ 1887.201047] ? __kthread_parkme+0xd7/0xf0\n [ 1887.201574] ? kthread+0x102/0x1d0\n [ 1887.202020] kthread+0x1ab/0x1d0\n [ 1887.202447] ? pr_cont_work+0x270/0x270\n [ 1887.202954] ? kthread_blkcg+0x50/0x50\n [ 1887.203444] ret_from_fork+0x34/0x50\n [ 1887.203914] ? kthread_blkcg+0x50/0x50\n [ 1887.204397] ret_from_fork_asm+0x11/0x20\n [ 1887.204913] </TASK>\n [ 1887.204913] </TASK>\n [ 1887.205209]\n [ 1887.205416] Allocated by task 2197:\n [ 1887.205881] kasan_set_track+0x3f/0x60\n [ 1887.206366] __kasan_kmalloc+0x6e/0x80\n [ 1887.206856] __kmalloc+0xac/0x1a0\n [ 1887.207293] btf_parse_fields+0xa15/0x1480\n [ 1887.207836] btf_parse_struct_metas+0x566/0x670\n [ 1887.208387] btf_new_fd+0x294/0x4d0\n [ 1887.208851] __sys_bpf+0x4ba/0x600\n [ 1887.209292] __x64_sys_bpf+0x41/0x50\n [ 1887.209762] do_syscall_64+0x4c/0xf0\n [ 1887.210222] entry_SYSCALL_64_after_hwframe+0x63/0x6b\n [ 1887.210868]\n [ 1887.211074] Freed by task 36:\n [ 1887.211460] kasan_set_track+0x3f/0x60\n [ 1887.211951] kasan_save_free_info+0x28/0x40\n [ 1887.212485] ____kasan_slab_free+0x101/0x180\n [ 1887.213027] __kmem_cache_free+0xe4/0x210\n [ 1887.213514] btf_free+0x5b/0x130\n [ 1887.213918] rcu_core+0x638/0xcc0\n [ 1887.214347] __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n 00000000000034c0 <bpf_rb_root_free>:\n ; {\n 34c0: f3 0f 1e fa endbr64\n 34c4: e8 00 00 00 00 callq 0x34c9 <bpf_rb_root_free+0x9>\n 34c9: 55 pushq %rbp\n 34ca: 48 89 e5 movq %rsp, %rbp\n ...\n ; if (rec && rec->refcount_off >= 0 &&\n 36aa: 4d 85 ed testq %r13, %r13\n 36ad: 74 a9 je 0x3658 <bpf_rb_root_free+0x198>\n 36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi\n 36b3: e8 00 00 00 00 callq 0x36b8 <bpf_rb_root_free+0x1f8>\n <==== kasan function\n 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d\n <==== use-after-free load\n 36bc: 45 85 ff testl %r15d, %r15d\n 36bf: 78 8c js 0x364d <bpf_rb_root_free+0x18d>\n\nSo the problem \n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/syscall.c"], "versions": [{"version": "958cf2e273f0929c66169e0788031310e8118722", "lessThan": "d048dced8ea5eac6723ae873a40567e6f101ea42", "status": "affected", "versionType": "git"}, {"version": "958cf2e273f0929c66169e0788031310e8118722", "lessThan": "f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306", "status": "affected", "versionType": "git"}, {"version": "958cf2e273f0929c66169e0788031310e8118722", "lessThan": "59e5791f59dd83e8aa72a4e74217eabb6e8cfd90", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/syscall.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.14", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.7.2", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8", "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": "6.2", "versionEndExcluding": "6.6.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"}, {"url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"}, {"url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"}], "title": "bpf: Fix a race condition between btf_put() and map_free()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-10-30T19:48:46.097566Z", "id": "CVE-2023-52446", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-30T19:48:56.151Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T22:55:41.647Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T22:55:41.647Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2023-52446", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2024-10-30T19:48:46.097566Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-24T20:38:09.591Z"}}], "cna": {"title": "bpf: Fix a race condition between btf_put() and map_free()", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "958cf2e273f0929c66169e0788031310e8118722", "lessThan": "d048dced8ea5eac6723ae873a40567e6f101ea42", "versionType": "git"}, {"status": "affected", "version": "958cf2e273f0929c66169e0788031310e8118722", "lessThan": "f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306", "versionType": "git"}, {"status": "affected", "version": "958cf2e273f0929c66169e0788031310e8118722", "lessThan": "59e5791f59dd83e8aa72a4e74217eabb6e8cfd90", "versionType": "git"}], "programFiles": ["kernel/bpf/syscall.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.2"}, {"status": "unaffected", "version": "0", "lessThan": "6.2", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.14", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.7.2", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/bpf/syscall.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"}, {"url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"}, {"url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n [ 1887.186498]\n [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494\n [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n [ 1887.190341] Call Trace:\n [ 1887.190666] <TASK>\n [ 1887.190949] dump_stack_lvl+0xac/0xe0\n [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0\n [ 1887.192019] ? panic+0x3c0/0x3c0\n [ 1887.192449] print_report+0x14f/0x720\n [ 1887.192930] ? preempt_count_sub+0x1c/0xd0\n [ 1887.193459] ? __virt_addr_valid+0xac/0x120\n [ 1887.194004] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.194572] kasan_report+0xc3/0x100\n [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0\n [ 1887.196736] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197270] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197802] ? _raw_spin_unlock+0x1f/0x40\n [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260\n [ 1887.198883] array_map_free+0x1a3/0x260\n [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0\n [ 1887.199943] process_scheduled_works+0x3a2/0x6c0\n [ 1887.200549] worker_thread+0x633/0x890\n [ 1887.201047] ? __kthread_parkme+0xd7/0xf0\n [ 1887.201574] ? kthread+0x102/0x1d0\n [ 1887.202020] kthread+0x1ab/0x1d0\n [ 1887.202447] ? pr_cont_work+0x270/0x270\n [ 1887.202954] ? kthread_blkcg+0x50/0x50\n [ 1887.203444] ret_from_fork+0x34/0x50\n [ 1887.203914] ? kthread_blkcg+0x50/0x50\n [ 1887.204397] ret_from_fork_asm+0x11/0x20\n [ 1887.204913] </TASK>\n [ 1887.204913] </TASK>\n [ 1887.205209]\n [ 1887.205416] Allocated by task 2197:\n [ 1887.205881] kasan_set_track+0x3f/0x60\n [ 1887.206366] __kasan_kmalloc+0x6e/0x80\n [ 1887.206856] __kmalloc+0xac/0x1a0\n [ 1887.207293] btf_parse_fields+0xa15/0x1480\n [ 1887.207836] btf_parse_struct_metas+0x566/0x670\n [ 1887.208387] btf_new_fd+0x294/0x4d0\n [ 1887.208851] __sys_bpf+0x4ba/0x600\n [ 1887.209292] __x64_sys_bpf+0x41/0x50\n [ 1887.209762] do_syscall_64+0x4c/0xf0\n [ 1887.210222] entry_SYSCALL_64_after_hwframe+0x63/0x6b\n [ 1887.210868]\n [ 1887.211074] Freed by task 36:\n [ 1887.211460] kasan_set_track+0x3f/0x60\n [ 1887.211951] kasan_save_free_info+0x28/0x40\n [ 1887.212485] ____kasan_slab_free+0x101/0x180\n [ 1887.213027] __kmem_cache_free+0xe4/0x210\n [ 1887.213514] btf_free+0x5b/0x130\n [ 1887.213918] rcu_core+0x638/0xcc0\n [ 1887.214347] __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n 00000000000034c0 <bpf_rb_root_free>:\n ; {\n 34c0: f3 0f 1e fa endbr64\n 34c4: e8 00 00 00 00 callq 0x34c9 <bpf_rb_root_free+0x9>\n 34c9: 55 pushq %rbp\n 34ca: 48 89 e5 movq %rsp, %rbp\n ...\n ; if (rec && rec->refcount_off >= 0 &&\n 36aa: 4d 85 ed testq %r13, %r13\n 36ad: 74 a9 je 0x3658 <bpf_rb_root_free+0x198>\n 36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi\n 36b3: e8 00 00 00 00 callq 0x36b8 <bpf_rb_root_free+0x1f8>\n <==== kasan function\n 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d\n <==== use-after-free load\n 36bc: 45 85 ff testl %r15d, %r15d\n 36bf: 78 8c js 0x364d <bpf_rb_root_free+0x18d>\n\nSo the problem \n---truncated---"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.14", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7.2", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8", "versionStartIncluding": "6.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:36:42.890Z"}}}, "cveMetadata": {"cveId": "CVE-2023-52446", "state": "PUBLISHED", "dateUpdated": "2025-05-04T07:36:42.890Z", "dateReserved": "2024-02-20T12:30:33.291Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-22T16:21:38.408Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BDBBEB0E-D13A-4567-8984-51C5375350B9", "versionEndExcluding": "6.6.14", "versionStartIncluding": "6.2.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0EA3778C-730B-464C-8023-18CA6AC0B807", "versionEndExcluding": "6.7.2", "versionStartIncluding": "6.7.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n [ 1887.186498]\n [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494\n [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n [ 1887.190341] Call Trace:\n [ 1887.190666] <TASK>\n [ 1887.190949] dump_stack_lvl+0xac/0xe0\n [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0\n [ 1887.192019] ? panic+0x3c0/0x3c0\n [ 1887.192449] print_report+0x14f/0x720\n [ 1887.192930] ? preempt_count_sub+0x1c/0xd0\n [ 1887.193459] ? __virt_addr_valid+0xac/0x120\n [ 1887.194004] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.194572] kasan_report+0xc3/0x100\n [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0\n [ 1887.196736] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197270] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197802] ? _raw_spin_unlock+0x1f/0x40\n [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260\n [ 1887.198883] array_map_free+0x1a3/0x260\n [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0\n [ 1887.199943] process_scheduled_works+0x3a2/0x6c0\n [ 1887.200549] worker_thread+0x633/0x890\n [ 1887.201047] ? __kthread_parkme+0xd7/0xf0\n [ 1887.201574] ? kthread+0x102/0x1d0\n [ 1887.202020] kthread+0x1ab/0x1d0\n [ 1887.202447] ? pr_cont_work+0x270/0x270\n [ 1887.202954] ? kthread_blkcg+0x50/0x50\n [ 1887.203444] ret_from_fork+0x34/0x50\n [ 1887.203914] ? kthread_blkcg+0x50/0x50\n [ 1887.204397] ret_from_fork_asm+0x11/0x20\n [ 1887.204913] </TASK>\n [ 1887.204913] </TASK>\n [ 1887.205209]\n [ 1887.205416] Allocated by task 2197:\n [ 1887.205881] kasan_set_track+0x3f/0x60\n [ 1887.206366] __kasan_kmalloc+0x6e/0x80\n [ 1887.206856] __kmalloc+0xac/0x1a0\n [ 1887.207293] btf_parse_fields+0xa15/0x1480\n [ 1887.207836] btf_parse_struct_metas+0x566/0x670\n [ 1887.208387] btf_new_fd+0x294/0x4d0\n [ 1887.208851] __sys_bpf+0x4ba/0x600\n [ 1887.209292] __x64_sys_bpf+0x41/0x50\n [ 1887.209762] do_syscall_64+0x4c/0xf0\n [ 1887.210222] entry_SYSCALL_64_after_hwframe+0x63/0x6b\n [ 1887.210868]\n [ 1887.211074] Freed by task 36:\n [ 1887.211460] kasan_set_track+0x3f/0x60\n [ 1887.211951] kasan_save_free_info+0x28/0x40\n [ 1887.212485] ____kasan_slab_free+0x101/0x180\n [ 1887.213027] __kmem_cache_free+0xe4/0x210\n [ 1887.213514] btf_free+0x5b/0x130\n [ 1887.213918] rcu_core+0x638/0xcc0\n [ 1887.214347] __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n 00000000000034c0 <bpf_rb_root_free>:\n ; {\n 34c0: f3 0f 1e fa endbr64\n 34c4: e8 00 00 00 00 callq 0x34c9 <bpf_rb_root_free+0x9>\n 34c9: 55 pushq %rbp\n 34ca: 48 89 e5 movq %rsp, %rbp\n ...\n ; if (rec && rec->refcount_off >= 0 &&\n 36aa: 4d 85 ed testq %r13, %r13\n 36ad: 74 a9 je 0x3658 <bpf_rb_root_free+0x198>\n 36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi\n 36b3: e8 00 00 00 00 callq 0x36b8 <bpf_rb_root_free+0x1f8>\n <==== kasan function\n 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d\n <==== use-after-free load\n 36bc: 45 85 ff testl %r15d, %r15d\n 36bf: 78 8c js 0x364d <bpf_rb_root_free+0x18d>\n\nSo the problem \n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige una condici\u00f3n de ejecuci\u00f3n entre btf_put() y map_free() Al ejecutar `./test_progs -j` en mi m\u00e1quina virtual local con el \u00faltimo kernel, una vez encontr\u00e9 un error kasan como a continuaci\u00f3n: [ 1887.184724] ERROR: KASAN: slab-use-after-free en bpf_rb_root_free+0x1f8/0x2b0 [ 1887.185599] Lectura del tama\u00f1o 4 en la direcci\u00f3n ffff888106806910 por tarea kworker/u12:2/2830 [ 1887.186498] [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Contaminado: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494 [1887.188034] Nombre de hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0 -0-g155821a1990b-prebuilt.qemu.org 01/04/2014 [1887.189618] Cola de trabajo: events_unbound bpf_map_free_deferred [1887.190341] Seguimiento de llamadas: [1887.190666] [1887.190949] dump_stack_lv l+0xac/0xe0 [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0 [1887.192019]? p\u00e1nico+0x3c0/0x3c0 [ 1887.192449] print_report+0x14f/0x720 [ 1887.192930] ? preempt_count_sub+0x1c/0xd0 [1887.193459]? __virt_addr_valid+0xac/0x120 [1887.194004]? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.194572] kasan_report+0xc3/0x100 [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0 [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0 [1887.196736]? preempt_count_sub+0x1c/0xd0 [1887.197270]? preempt_count_sub+0x1c/0xd0 [1887.197802]? _raw_spin_unlock+0x1f/0x40 [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260 [ 1887.198883] array_map_free+0x1a3/0x260 [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0 [ 18 87.199943] Process_scheduled_works+0x3a2/0x6c0 [1887.200549] trabajador_thread+0x633/0x890 [1887.201047]? __kthread_parkme+0xd7/0xf0 [ 1887.201574] ? kthread+0x102/0x1d0 [ 1887.202020] kthread+0x1ab/0x1d0 [ 1887.202447] ? pr_cont_work+0x270/0x270 [1887.202954]? kthread_blkcg+0x50/0x50 [ 1887.203444] ret_from_fork+0x34/0x50 [ 1887.203914] ? kthread_blkcg+0x50/0x50 [ 1887.204397] ret_from_fork_asm+0x11/0x20 [ 1887.204913] [ 1887.204913] [ 1887.205209] [ 1887.205416] Asignado por tarea 2197: [1887.205881] kasan_set_track+0x3f/0x60 [1887.206366] __kasan_kmalloc +0x6e/0x80 [ 1887.206856] __kmalloc+0xac/0x1a0 [ 1887.207293] btf_parse_fields+0xa15/0x1480 [ 1887.207836] btf_parse_struct_metas+0x566/0x670 [ 1887.208387 ] btf_new_fd+0x294/0x4d0 [ 1887.208851] __sys_bpf+0x4ba/0x600 [ 1887.209292] __x64_sys_bpf+0x41 /0x50 [ 1887.209762] do_syscall_64+0x4c/0xf0 [ 1887.210222] Entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 1887.210868] [ 1887.211074] Liberado por la tarea 36: [ 1887.21146 0] kasan_set_track+0x3f/0x60 [ 1887.211951] kasan_save_free_info+0x28/0x40 [ 1887.212485] ____kasan_slab_free+ 0x101/0x180 [ 1887.213027] __kmem_cache_free+0xe4/0x210 [ 1887.213514] btf_free+0x5b/0x130 [ 1887.213918] rcu_core+0x638/0xcc0 [ 1887.214347] __do_ softirq+0x114/0x37e El error ocurre en bpf_rb_root_free+0x1f8/0x2b0: 00000000000034c0 : ; { 34c0: f3 0f 1e fa endbr64 34c4: e8 00 00 00 00 callq 0x34c9 34c9: 55 pushq %rbp 34ca: 48 89 e5 movq %rsp, %rbp ... ; if (rec &amp;&amp; rec-&gt;refcount_off &gt;= 0 &amp;&amp; 36aa: 4d 85 ed testq %r13, %r13 36ad: 74 a9 je 0x3658 36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi 36b3 : e8 00 00 00 00 callq 0x36b8 &lt;==== funci\u00f3n kasan 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d &lt;==== carga de uso despu\u00e9s de liberaci\u00f3n 36bc: 45 85 ff testl %r15d, %r15d 36bf: 78 8c js 0x364d Entonces el problema ---truncado---"}], "id": "CVE-2023-52446", "lastModified": "2024-11-21T08:39:46.940", "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-02-22T17:15:08.527", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix a race condition between btf_put() and map_free()", "id": "2265655", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2265655"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.9", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix a race condition between btf_put() and map_free()\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n[ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n[ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n[ 1887.186498]\n[ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494\n[ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n[ 1887.190341] Call Trace:\n[ 1887.190666] <TASK>\n[ 1887.190949] dump_stack_lvl+0xac/0xe0\n[ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0\n[ 1887.192019] ? panic+0x3c0/0x3c0\n[ 1887.192449] print_report+0x14f/0x720\n[ 1887.192930] ? preempt_count_sub+0x1c/0xd0\n[ 1887.193459] ? __virt_addr_valid+0xac/0x120\n[ 1887.194004] ? bpf_rb_root_free+0x1f8/0x2b0\n[ 1887.194572] kasan_report+0xc3/0x100\n[ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0\n[ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0\n[ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0\n[ 1887.196736] ? preempt_count_sub+0x1c/0xd0\n[ 1887.197270] ? preempt_count_sub+0x1c/0xd0\n[ 1887.197802] ? _raw_spin_unlock+0x1f/0x40\n[ 1887.198319] bpf_obj_free_fields+0x1d4/0x260\n[ 1887.198883] array_map_free+0x1a3/0x260\n[ 1887.199380] bpf_map_free_deferred+0x7b/0xe0\n[ 1887.199943] process_scheduled_works+0x3a2/0x6c0\n[ 1887.200549] worker_thread+0x633/0x890\n[ 1887.201047] ? __kthread_parkme+0xd7/0xf0\n[ 1887.201574] ? kthread+0x102/0x1d0\n[ 1887.202020] kthread+0x1ab/0x1d0\n[ 1887.202447] ? pr_cont_work+0x270/0x270\n[ 1887.202954] ? kthread_blkcg+0x50/0x50\n[ 1887.203444] ret_from_fork+0x34/0x50\n[ 1887.203914] ? kthread_blkcg+0x50/0x50\n[ 1887.204397] ret_from_fork_asm+0x11/0x20\n[ 1887.204913] </TASK>\n[ 1887.204913] </TASK>\n[ 1887.205209]\n[ 1887.205416] Allocated by task 2197:\n[ 1887.205881] kasan_set_track+0x3f/0x60\n[ 1887.206366] __kasan_kmalloc+0x6e/0x80\n[ 1887.206856] __kmalloc+0xac/0x1a0\n[ 1887.207293] btf_parse_fields+0xa15/0x1480\n[ 1887.207836] btf_parse_struct_metas+0x566/0x670\n[ 1887.208387] btf_new_fd+0x294/0x4d0\n[ 1887.208851] __sys_bpf+0x4ba/0x600\n[ 1887.209292] __x64_sys_bpf+0x41/0x50\n[ 1887.209762] do_syscall_64+0x4c/0xf0\n[ 1887.210222] entry_SYSCALL_64_after_hwframe+0x63/0x6b\n[ 1887.210868]\n[ 1887.211074] Freed by task 36:\n[ 1887.211460] kasan_set_track+0x3f/0x60\n[ 1887.211951] kasan_save_free_info+0x28/0x40\n[ 1887.212485] ____kasan_slab_free+0x101/0x180\n[ 1887.213027] __kmem_cache_free+0xe4/0x210\n[ 1887.213514] btf_free+0x5b/0x130\n[ 1887.213918] rcu_core+0x638/0xcc0\n[ 1887.214347] __do_softirq+0x114/0x37e\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n00000000000034c0 <bpf_rb_root_free>:\n; {\n34c0: f3 0f 1e fa endbr64\n34c4: e8 00 00 00 00 callq 0x34c9 <bpf_rb_root_free+0x9>\n34c9: 55 pushq %rbp\n34ca: 48 89 e5 movq %rsp, %rbp\n...\n; if (rec && rec->refcount_off >= 0 &&\n36aa: 4d 85 ed testq %r13, %r13\n36ad: 74 a9 je 0x3658 <bpf_rb_root_free+0x198>\n36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi\n36b3: e8 00 00 00 00 callq 0x36b8 <bpf_rb_root_free+0x1f8>\n<==== kasan function\n36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d\n<==== use-after-free load\n36bc: 45 85 ff testl %r15d, %r15d\n36bf: 78 8c js 0x364d <bpf_rb_root_free+0x18d>\nSo the problem \n---truncated---"], "mitigation": {"lang": "en:us", "value": "No mitigation is currently available for this vulnerability. Make sure to perform the updates as they become available."}, "name": "CVE-2023-52446", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Not affected", "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": "2024-02-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52446\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52446\nhttps://lore.kernel.org/linux-cve-announce/2024022254-CVE-2023-52446-2812@gregkh/T/#u"], "threat_severity": "Low"}

{}