{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-48914", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T06:06:23.294Z", "datePublished": "2024-08-22T01:32:07.803Z", "dateUpdated": "2026-05-11T18:49:36.523Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T18:49:36.523Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netfront: destroy queues before real_num_tx_queues is zeroed\n\nxennet_destroy_queues() relies on info->netdev->real_num_tx_queues to\ndelete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\n(\"net-sysfs: update the queue counts in the unregistration path\"),\nunregister_netdev() indirectly sets real_num_tx_queues to 0. Those two\nfacts together means, that xennet_destroy_queues() called from\nxennet_remove() cannot do its job, because it's called after\nunregister_netdev(). This results in kfree-ing queues that are still\nlinked in napi, which ultimately crashes:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 52 Comm: xenwatch Tainted: G W 5.16.10-1.32.fc32.qubes.x86_64+ #226\n RIP: 0010:free_netdev+0xa3/0x1a0\n Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff <48> 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00\n RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286\n RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000\n RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff\n RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000\n R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050\n R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680\n FS: 0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0\n Call Trace:\n <TASK>\n xennet_remove+0x13d/0x300 [xen_netfront]\n xenbus_dev_remove+0x6d/0xf0\n __device_release_driver+0x17a/0x240\n device_release_driver+0x24/0x30\n bus_remove_device+0xd8/0x140\n device_del+0x18b/0x410\n ? _raw_spin_unlock+0x16/0x30\n ? klist_iter_exit+0x14/0x20\n ? xenbus_dev_request_and_reply+0x80/0x80\n device_unregister+0x13/0x60\n xenbus_dev_changed+0x18e/0x1f0\n xenwatch_thread+0xc0/0x1a0\n ? do_wait_intr_irq+0xa0/0xa0\n kthread+0x16b/0x190\n ? set_kthread_struct+0x40/0x40\n ret_from_fork+0x22/0x30\n </TASK>\n\nFix this by calling xennet_destroy_queues() from xennet_uninit(),\nwhen real_num_tx_queues is still available. This ensures that queues are\ndestroyed when real_num_tx_queues is set to 0, regardless of how\nunregister_netdev() was called.\n\nOriginally reported at\nhttps://github.com/QubesOS/qubes-issues/issues/7257"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/xen-netfront.c"], "versions": [{"version": "35cad2003b6447932cfe91f795090586306738e8", "lessThan": "198cdc287769c717dafff5887c6125cb7a373bf3", "status": "affected", "versionType": "git"}, {"version": "a5d8e6189b134f5db61be5cd59cf5a74bb01edc7", "lessThan": "b40c912624775a21da32d1105e158db5f6d0554a", "status": "affected", "versionType": "git"}, {"version": "443133330a5d4a3fd429179d460cc297724fefe8", "lessThan": "a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8", "status": "affected", "versionType": "git"}, {"version": "0abd3f9903fae6ecf8db3c89a459971fe7925499", "lessThan": "a63eb1e4a2e1a191a90217871e67fba42fd39255", "status": "affected", "versionType": "git"}, {"version": "c5eb468cbc1fa663bf0cc6c5360802dea4e611c2", "lessThan": "47e2f166ed9fe17f24561d6315be2228f6a90209", "status": "affected", "versionType": "git"}, {"version": "d7dac083414eb5bb99a6d2ed53dc2c1b405224e5", "lessThan": "dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/xen-netfront.c"], "versions": [{"version": "4.19.226", "lessThan": "4.19.233", "status": "affected", "versionType": "semver"}, {"version": "5.4.174", "lessThan": "5.4.183", "status": "affected", "versionType": "semver"}, {"version": "5.10.94", "lessThan": "5.10.104", "status": "affected", "versionType": "semver"}, {"version": "5.15.17", "lessThan": "5.15.27", "status": "affected", "versionType": "semver"}, {"version": "5.16.3", "lessThan": "5.16.13", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.226", "versionEndExcluding": "4.19.233"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.174", "versionEndExcluding": "5.4.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.94", "versionEndExcluding": "5.10.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.17", "versionEndExcluding": "5.15.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16.3", "versionEndExcluding": "5.16.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3"}, {"url": "https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a"}, {"url": "https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8"}, {"url": "https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255"}, {"url": "https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209"}, {"url": "https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f"}], "title": "xen/netfront: destroy queues before real_num_tx_queues is zeroed", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-48914", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:33:50.755135Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:11.621Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-48914", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:33:50.755135Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:15.841Z"}}], "cna": {"title": "xen/netfront: destroy queues before real_num_tx_queues is zeroed", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "35cad2003b6447932cfe91f795090586306738e8", "lessThan": "198cdc287769c717dafff5887c6125cb7a373bf3", "versionType": "git"}, {"status": "affected", "version": "a5d8e6189b134f5db61be5cd59cf5a74bb01edc7", "lessThan": "b40c912624775a21da32d1105e158db5f6d0554a", "versionType": "git"}, {"status": "affected", "version": "443133330a5d4a3fd429179d460cc297724fefe8", "lessThan": "a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8", "versionType": "git"}, {"status": "affected", "version": "0abd3f9903fae6ecf8db3c89a459971fe7925499", "lessThan": "a63eb1e4a2e1a191a90217871e67fba42fd39255", "versionType": "git"}, {"status": "affected", "version": "c5eb468cbc1fa663bf0cc6c5360802dea4e611c2", "lessThan": "47e2f166ed9fe17f24561d6315be2228f6a90209", "versionType": "git"}, {"status": "affected", "version": "d7dac083414eb5bb99a6d2ed53dc2c1b405224e5", "lessThan": "dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f", "versionType": "git"}], "programFiles": ["drivers/net/xen-netfront.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.19.226", "lessThan": "4.19.233", "versionType": "semver"}, {"status": "affected", "version": "5.4.174", "lessThan": "5.4.183", "versionType": "semver"}, {"status": "affected", "version": "5.10.94", "lessThan": "5.10.104", "versionType": "semver"}, {"status": "affected", "version": "5.15.17", "lessThan": "5.15.27", "versionType": "semver"}, {"status": "affected", "version": "5.16.3", "lessThan": "5.16.13", "versionType": "semver"}], "programFiles": ["drivers/net/xen-netfront.c"], "defaultStatus": "unaffected"}], "references": [{"url": "https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3"}, {"url": "https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a"}, {"url": "https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8"}, {"url": "https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255"}, {"url": "https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209"}, {"url": "https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netfront: destroy queues before real_num_tx_queues is zeroed\n\nxennet_destroy_queues() relies on info->netdev->real_num_tx_queues to\ndelete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\n(\"net-sysfs: update the queue counts in the unregistration path\"),\nunregister_netdev() indirectly sets real_num_tx_queues to 0. Those two\nfacts together means, that xennet_destroy_queues() called from\nxennet_remove() cannot do its job, because it's called after\nunregister_netdev(). This results in kfree-ing queues that are still\nlinked in napi, which ultimately crashes:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 52 Comm: xenwatch Tainted: G W 5.16.10-1.32.fc32.qubes.x86_64+ #226\n RIP: 0010:free_netdev+0xa3/0x1a0\n Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff <48> 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00\n RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286\n RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000\n RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff\n RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000\n R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050\n R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680\n FS: 0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0\n Call Trace:\n <TASK>\n xennet_remove+0x13d/0x300 [xen_netfront]\n xenbus_dev_remove+0x6d/0xf0\n __device_release_driver+0x17a/0x240\n device_release_driver+0x24/0x30\n bus_remove_device+0xd8/0x140\n device_del+0x18b/0x410\n ? _raw_spin_unlock+0x16/0x30\n ? klist_iter_exit+0x14/0x20\n ? xenbus_dev_request_and_reply+0x80/0x80\n device_unregister+0x13/0x60\n xenbus_dev_changed+0x18e/0x1f0\n xenwatch_thread+0xc0/0x1a0\n ? do_wait_intr_irq+0xa0/0xa0\n kthread+0x16b/0x190\n ? set_kthread_struct+0x40/0x40\n ret_from_fork+0x22/0x30\n </TASK>\n\nFix this by calling xennet_destroy_queues() from xennet_uninit(),\nwhen real_num_tx_queues is still available. This ensures that queues are\ndestroyed when real_num_tx_queues is set to 0, regardless of how\nunregister_netdev() was called.\n\nOriginally reported at\nhttps://github.com/QubesOS/qubes-issues/issues/7257"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.233", "versionStartIncluding": "4.19.226"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.183", "versionStartIncluding": "5.4.174"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.104", "versionStartIncluding": "5.10.94"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.27", "versionStartIncluding": "5.15.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16.13", "versionStartIncluding": "5.16.3"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T08:26:00.352Z"}}}, "cveMetadata": {"cveId": "CVE-2022-48914", "state": "PUBLISHED", "dateUpdated": "2025-05-04T08:26:00.352Z", "dateReserved": "2024-08-21T06:06:23.294Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-08-22T01:32:07.803Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "844F8286-579D-45F3-91F9-B0963A45C46A", "versionEndExcluding": "4.19.233", "versionStartIncluding": "4.19.226", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "50DC6A9D-EDB7-4237-9253-6A36CB2A79E7", "versionEndExcluding": "5.4.183", "versionStartIncluding": "5.4.174", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "07144469-6081-4ABC-AD38-F23A8D9B3E86", "versionEndExcluding": "5.10.104", "versionStartIncluding": "5.10.94", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A3C6A607-7094-4C3C-B703-C6B5A1F87670", "versionEndExcluding": "5.15.27", "versionStartIncluding": "5.15.17", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CA1CE57C-E9AE-4BFC-8E39-AECD1A63C9A0", "versionEndExcluding": "5.16.13", "versionStartIncluding": "5.16.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netfront: destroy queues before real_num_tx_queues is zeroed\n\nxennet_destroy_queues() relies on info->netdev->real_num_tx_queues to\ndelete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\n(\"net-sysfs: update the queue counts in the unregistration path\"),\nunregister_netdev() indirectly sets real_num_tx_queues to 0. Those two\nfacts together means, that xennet_destroy_queues() called from\nxennet_remove() cannot do its job, because it's called after\nunregister_netdev(). This results in kfree-ing queues that are still\nlinked in napi, which ultimately crashes:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 52 Comm: xenwatch Tainted: G W 5.16.10-1.32.fc32.qubes.x86_64+ #226\n RIP: 0010:free_netdev+0xa3/0x1a0\n Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff <48> 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00\n RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286\n RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000\n RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff\n RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000\n R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050\n R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680\n FS: 0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0\n Call Trace:\n <TASK>\n xennet_remove+0x13d/0x300 [xen_netfront]\n xenbus_dev_remove+0x6d/0xf0\n __device_release_driver+0x17a/0x240\n device_release_driver+0x24/0x30\n bus_remove_device+0xd8/0x140\n device_del+0x18b/0x410\n ? _raw_spin_unlock+0x16/0x30\n ? klist_iter_exit+0x14/0x20\n ? xenbus_dev_request_and_reply+0x80/0x80\n device_unregister+0x13/0x60\n xenbus_dev_changed+0x18e/0x1f0\n xenwatch_thread+0xc0/0x1a0\n ? do_wait_intr_irq+0xa0/0xa0\n kthread+0x16b/0x190\n ? set_kthread_struct+0x40/0x40\n ret_from_fork+0x22/0x30\n </TASK>\n\nFix this by calling xennet_destroy_queues() from xennet_uninit(),\nwhen real_num_tx_queues is still available. This ensures that queues are\ndestroyed when real_num_tx_queues is set to 0, regardless of how\nunregister_netdev() was called.\n\nOriginally reported at\nhttps://github.com/QubesOS/qubes-issues/issues/7257"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xen/netfront: destruye colas antes de que real_num_tx_queues se ponga a cero xennet_destroy_queues() se basa en info-&gt;netdev-&gt;real_num_tx_queues para eliminar colas. Dado que d7dac083414eb5bb99a6d2ed53dc2c1b405224e5 (\"net-sysfs: actualice los recuentos de colas en la ruta de cancelaci\u00f3n de registro\"), unregister_netdev() establece indirectamente real_num_tx_queues en 0. Esos dos hechos juntos significan que xennet_destroy_queues() llamado desde xennet_remove() no puede hacer su trabajo, porque s llamado despu\u00e9s de unregister_netdev(). Esto da como resultado colas kfree-ing que todav\u00eda est\u00e1n vinculadas en napi, lo que finalmente falla: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000000 #PF: acceso de lectura del supervisor en modo kernel #PF: c\u00f3digo_error(0x0000) - PGD de p\u00e1gina no presente 0 P4D 0 Ups: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 52 Comm: xenwatch Tainted: GW 5.16.10-1.32.fc32.qubes.x86_64+ #226 RIP: 0010:free_netdev+0xa3/0x1a0 C\u00f3digo: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff &lt;48&gt; 8b 85 60 01 00 0 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00 RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000 RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff RBP: fffffffffffffea0 R08: 00000000000000000 R09: 00000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050 R13: ffff8880065f8f88 R14: 00000000000000000 R15: ffff8880066c6680 FS: 00000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: CR3: 00000000e998c006 CR4: 00000000003706e0 Seguimiento de llamadas: xennet_remove+0x13d/0x300 [xen_netfront] xenbus_dev_remove+0x6d/0xf0 __device_release_driver+0x17a/0x240 device_release_driver+0x24/ 0x30 bus_remove_device+0xd8/0x140 dispositivo_del+0x18b/0x410? _raw_spin_unlock+0x16/0x30? klist_iter_exit+0x14/0x20? xenbus_dev_request_and_reply+0x80/0x80 dispositivo_unregister+0x13/0x60 xenbus_dev_changed+0x18e/0x1f0 xenwatch_thread+0xc0/0x1a0 ? do_wait_intr_irq+0xa0/0xa0 kthread+0x16b/0x190 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x22/0x30 Solucione este problema llamando a xennet_destroy_queues() desde xennet_uninit(), cuando real_num_tx_queues todav\u00eda est\u00e9 disponible. Esto garantiza que las colas se destruyan cuando real_num_tx_queues se establece en 0, independientemente de c\u00f3mo se llam\u00f3 a unregister_netdev(). Reportado originalmente en https://github.com/QubesOS/qubes-issues/issues/7257"}], "id": "CVE-2022-48914", "lastModified": "2024-09-12T13:27:34.623", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-08-22T02:15:05.683", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: xen/netfront: destroy queues before real_num_tx_queues is zeroed", "id": "2307167", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2307167"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxen/netfront: destroy queues before real_num_tx_queues is zeroed\nxennet_destroy_queues() relies on info->netdev->real_num_tx_queues to\ndelete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\n(\"net-sysfs: update the queue counts in the unregistration path\"),\nunregister_netdev() indirectly sets real_num_tx_queues to 0. Those two\nfacts together means, that xennet_destroy_queues() called from\nxennet_remove() cannot do its job, because it's called after\nunregister_netdev(). This results in kfree-ing queues that are still\nlinked in napi, which ultimately crashes:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n#PF: supervisor read access in kernel mode\n#PF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 1 PID: 52 Comm: xenwatch Tainted: G W 5.16.10-1.32.fc32.qubes.x86_64+ #226\nRIP: 0010:free_netdev+0xa3/0x1a0\nCode: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff <48> 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00\nRSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286\nRAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000\nRDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff\nRBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050\nR13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680\nFS: 0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0\nCall Trace:\n<TASK>\nxennet_remove+0x13d/0x300 [xen_netfront]\nxenbus_dev_remove+0x6d/0xf0\n__device_release_driver+0x17a/0x240\ndevice_release_driver+0x24/0x30\nbus_remove_device+0xd8/0x140\ndevice_del+0x18b/0x410\n? _raw_spin_unlock+0x16/0x30\n? klist_iter_exit+0x14/0x20\n? xenbus_dev_request_and_reply+0x80/0x80\ndevice_unregister+0x13/0x60\nxenbus_dev_changed+0x18e/0x1f0\nxenwatch_thread+0xc0/0x1a0\n? do_wait_intr_irq+0xa0/0xa0\nkthread+0x16b/0x190\n? set_kthread_struct+0x40/0x40\nret_from_fork+0x22/0x30\n</TASK>\nFix this by calling xennet_destroy_queues() from xennet_uninit(),\nwhen real_num_tx_queues is still available. This ensures that queues are\ndestroyed when real_num_tx_queues is set to 0, regardless of how\nunregister_netdev() was called.\nOriginally reported at\nhttps://github.com/QubesOS/qubes-issues/issues/7257"], "name": "CVE-2022-48914", "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": "Will not fix", "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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48914\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48914\nhttps://lore.kernel.org/linux-cve-announce/2024082216-CVE-2022-48914-97e1@gregkh/T"], "threat_severity": "Moderate"}

{}