CVE-2026-64435 (GCVE-0-2026-64435)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-10-19 20:38
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: audit: Fix data races of skb_queue_len() readers on audit_queue Multiple readers access audit_queue.qlen via skb_queue_len() without holding the queue lock or using READ_ONCE(), while kauditd writes to this field via the skb_dequeue() → __skb_unlink() path with WRITE_ONCE() protected by a spinlock. This constitutes data races. All affected skb_queue_len(&audit_queue) call sites: - kauditd_thread() wait_event_freezable() condition - audit_receive_msg() AUDIT_GET handler (s.backlog assignment) - audit_receive() backlog check - audit_log_start() backlog check and pr_warn() KCSAN reports the following conflicting access pattern (one example): ================================================================== BUG: KCSAN: data-race in audit_log_start / skb_dequeue write (marked) to 0xffffffff8512ee20 of 4 bytes by task 661 on cpu 57: skb_dequeue+0x70/0xf0 kauditd_send_queue+0x71/0x220 kauditd_thread+0x1cb/0x430 kthread+0x1c2/0x210 ret_from_fork+0x162/0x1a0 ret_from_fork_asm+0x1a/0x30 read to 0xffffffff8512ee20 of 4 bytes by task 36586 on cpu 1: audit_log_start+0x2a0/0x6b0 audit_core_dumps+0x64/0xa0 do_coredump+0x14b/0x1260 get_signal+0xeb2/0xf70 arch_do_signal_or_restart+0x41/0x170 exit_to_user_mode_loop+0xa2/0x1c0 do_syscall_64+0x1a3/0x1c0 entry_SYSCALL_64_after_hwframe+0x76/0xe0 value changed: 0x00000001 -> 0x00000000 ================================================================== Resolve the race by switching to lockless helper skb_queue_len_lockless(), which internally uses READ_ONCE() and properly pairs with the WRITE_ONCE() write accesses already present on the writer side. [PM: line length tweak]
References
Impacted products
Vendor Product Version
Linux Linux Version: 3197542482df22c2a131d4a813280bd7c54cedf5
Version: 3197542482df22c2a131d4a813280bd7c54cedf5
Version: 3197542482df22c2a131d4a813280bd7c54cedf5
Version: 3197542482df22c2a131d4a813280bd7c54cedf5
Version: 3197542482df22c2a131d4a813280bd7c54cedf5
Version: 3197542482df22c2a131d4a813280bd7c54cedf5
Version: 3197542482df22c2a131d4a813280bd7c54cedf5
Version: 3197542482df22c2a131d4a813280bd7c54cedf5
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naudit: Fix data races of skb_queue_len() readers on audit_queue\n\nMultiple readers access audit_queue.qlen via skb_queue_len() without\nholding the queue lock or using READ_ONCE(), while kauditd writes to\nthis field via the skb_dequeue() \u2192 __skb_unlink() path with WRITE_ONCE()\nprotected by a spinlock. This constitutes data races.\n\nAll affected skb_queue_len(\u0026audit_queue) call sites:\n  - kauditd_thread() wait_event_freezable() condition\n  - audit_receive_msg() AUDIT_GET handler (s.backlog assignment)\n  - audit_receive() backlog check\n  - audit_log_start() backlog check and pr_warn()\n\nKCSAN reports the following conflicting access pattern (one example):\n==================================================================\nBUG: KCSAN: data-race in audit_log_start / skb_dequeue\n\nwrite (marked) to 0xffffffff8512ee20 of 4 bytes by task 661 on cpu 57:\n skb_dequeue+0x70/0xf0\n kauditd_send_queue+0x71/0x220\n kauditd_thread+0x1cb/0x430\n kthread+0x1c2/0x210\n ret_from_fork+0x162/0x1a0\n ret_from_fork_asm+0x1a/0x30\n\nread to 0xffffffff8512ee20 of 4 bytes by task 36586 on cpu 1:\n audit_log_start+0x2a0/0x6b0\n audit_core_dumps+0x64/0xa0\n do_coredump+0x14b/0x1260\n get_signal+0xeb2/0xf70\n arch_do_signal_or_restart+0x41/0x170\n exit_to_user_mode_loop+0xa2/0x1c0\n do_syscall_64+0x1a3/0x1c0\n entry_SYSCALL_64_after_hwframe+0x76/0xe0\n\nvalue changed: 0x00000001 -\u003e 0x00000000\n==================================================================\n\nResolve the race by switching to lockless helper skb_queue_len_lockless(),\nwhich internally uses READ_ONCE() and properly pairs with the WRITE_ONCE()\nwrite accesses already present on the writer side.\n\n[PM: line length tweak]"
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-64435\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:40:38.595570Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-362\", \"description\": \"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:40:39.204Z\"}}], \"cna\": {\"title\": \"audit: Fix data races of skb_queue_len() readers on audit_queue\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.2, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - Unauthenticated packets matching a pre-existing nftables audit-level logging or xtables AUDIT rule reach audit_log_start() through the network receive and netfilter paths.\\nAC:L - Parallel matching traffic invokes the vulnerable readers while feeding and waking kauditd, allowing the attacker to repeatedly drive both sides of the race.\\nPR:N - The audit rule must already be configured, but the remote attacker needs no credentials or capabilities to send matching packets.\\nUI:N - No victim action is required after the affected network-audit configuration is active.\\nS:U - The race and its effects remain within the host kernel and its audit security authority.\\nC:N - The raced value is only the 32-bit queue length; no pointer, packet contents, or adjacent memory is disclosed.\\nI:L - An incorrect backlog decision can delay or discard audit records, causing limited corruption of the security audit trail without an arbitrary-write primitive.\\nA:H - In hardened systems using AUDIT_FAIL_PANIC, a raced queue length interpreted as exceeding the limit from the GFP_ATOMIC packet-audit path calls audit_log_lost() and can panic the kernel.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"69f98fff30bdaa72b0cb0e7e078ab6456a0a59b0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"b35597bdae1a5d8395da4b9baa993b9b71f74d68\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"e575dabb805252e3113fdc3f56f6ecacfde422d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"7ff42312ccde549f8c698723822c7db35107a39b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"a3d85dec60bb0622360fc176b2a51abdbe2ff0ad\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"fe997a84a385f840b593ead92e575503a5046cee\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"c5186201fa7030289cc4fe23fae87a3fcb566856\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3197542482df22c2a131d4a813280bd7c54cedf5\", \"lessThan\": \"c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/audit.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.96\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/audit.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/69f98fff30bdaa72b0cb0e7e078ab6456a0a59b0\"}, {\"url\": \"https://git.kernel.org/stable/c/b35597bdae1a5d8395da4b9baa993b9b71f74d68\"}, {\"url\": \"https://git.kernel.org/stable/c/e575dabb805252e3113fdc3f56f6ecacfde422d0\"}, {\"url\": \"https://git.kernel.org/stable/c/7ff42312ccde549f8c698723822c7db35107a39b\"}, {\"url\": \"https://git.kernel.org/stable/c/a3d85dec60bb0622360fc176b2a51abdbe2ff0ad\"}, {\"url\": \"https://git.kernel.org/stable/c/fe997a84a385f840b593ead92e575503a5046cee\"}, {\"url\": \"https://git.kernel.org/stable/c/c5186201fa7030289cc4fe23fae87a3fcb566856\"}, {\"url\": \"https://git.kernel.org/stable/c/c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\naudit: Fix data races of skb_queue_len() readers on audit_queue\\n\\nMultiple readers access audit_queue.qlen via skb_queue_len() without\\nholding the queue lock or using READ_ONCE(), while kauditd writes to\\nthis field via the skb_dequeue() \\u2192 __skb_unlink() path with WRITE_ONCE()\\nprotected by a spinlock. This constitutes data races.\\n\\nAll affected skb_queue_len(\u0026audit_queue) call sites:\\n  - kauditd_thread() wait_event_freezable() condition\\n  - audit_receive_msg() AUDIT_GET handler (s.backlog assignment)\\n  - audit_receive() backlog check\\n  - audit_log_start() backlog check and pr_warn()\\n\\nKCSAN reports the following conflicting access pattern (one example):\\n==================================================================\\nBUG: KCSAN: data-race in audit_log_start / skb_dequeue\\n\\nwrite (marked) to 0xffffffff8512ee20 of 4 bytes by task 661 on cpu 57:\\n skb_dequeue+0x70/0xf0\\n kauditd_send_queue+0x71/0x220\\n kauditd_thread+0x1cb/0x430\\n kthread+0x1c2/0x210\\n ret_from_fork+0x162/0x1a0\\n ret_from_fork_asm+0x1a/0x30\\n\\nread to 0xffffffff8512ee20 of 4 bytes by task 36586 on cpu 1:\\n audit_log_start+0x2a0/0x6b0\\n audit_core_dumps+0x64/0xa0\\n do_coredump+0x14b/0x1260\\n get_signal+0xeb2/0xf70\\n arch_do_signal_or_restart+0x41/0x170\\n exit_to_user_mode_loop+0xa2/0x1c0\\n do_syscall_64+0x1a3/0x1c0\\n entry_SYSCALL_64_after_hwframe+0x76/0xe0\\n\\nvalue changed: 0x00000001 -\u003e 0x00000000\\n==================================================================\\n\\nResolve the race by switching to lockless helper skb_queue_len_lockless(),\\nwhich internally uses READ_ONCE() and properly pairs with the WRITE_ONCE()\\nwrite accesses already present on the writer side.\\n\\n[PM: line length tweak]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:55:36.444Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64435\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:28.743Z\", \"dateReserved\": \"2026-07-19T15:36:31.787Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:51:09.688Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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