CVE-2026-64435 (GCVE-0-2026-64435)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51
VLAI
EPSS
VEX
Title
audit: Fix data races of skb_queue_len() readers on audit_queue
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]
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
3197542482df22c2a131d4a813280bd7c54cedf5 , < 69f98fff30bdaa72b0cb0e7e078ab6456a0a59b0
(git)
Affected: 3197542482df22c2a131d4a813280bd7c54cedf5 , < b35597bdae1a5d8395da4b9baa993b9b71f74d68 (git) Affected: 3197542482df22c2a131d4a813280bd7c54cedf5 , < e575dabb805252e3113fdc3f56f6ecacfde422d0 (git) Affected: 3197542482df22c2a131d4a813280bd7c54cedf5 , < 7ff42312ccde549f8c698723822c7db35107a39b (git) Affected: 3197542482df22c2a131d4a813280bd7c54cedf5 , < a3d85dec60bb0622360fc176b2a51abdbe2ff0ad (git) Affected: 3197542482df22c2a131d4a813280bd7c54cedf5 , < fe997a84a385f840b593ead92e575503a5046cee (git) Affected: 3197542482df22c2a131d4a813280bd7c54cedf5 , < c5186201fa7030289cc4fe23fae87a3fcb566856 (git) Affected: 3197542482df22c2a131d4a813280bd7c54cedf5 , < c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7 (git) |
|
| Linux | Linux |
Affected:
4.10
Unaffected: 0 , < 4.10 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/audit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "69f98fff30bdaa72b0cb0e7e078ab6456a0a59b0",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
},
{
"lessThan": "b35597bdae1a5d8395da4b9baa993b9b71f74d68",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
},
{
"lessThan": "e575dabb805252e3113fdc3f56f6ecacfde422d0",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
},
{
"lessThan": "7ff42312ccde549f8c698723822c7db35107a39b",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
},
{
"lessThan": "a3d85dec60bb0622360fc176b2a51abdbe2ff0ad",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
},
{
"lessThan": "fe997a84a385f840b593ead92e575503a5046cee",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
},
{
"lessThan": "c5186201fa7030289cc4fe23fae87a3fcb566856",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
},
{
"lessThan": "c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7",
"status": "affected",
"version": "3197542482df22c2a131d4a813280bd7c54cedf5",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/audit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.10"
},
{
"lessThan": "4.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2-rc3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.96",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.39",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.4",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2-rc3",
"versionStartIncluding": "4.10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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]"
}
],
"providerMetadata": {
"dateUpdated": "2026-07-25T08:51:09.688Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "audit: Fix data races of skb_queue_len() readers on audit_queue",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64435",
"datePublished": "2026-07-25T08:51:09.688Z",
"dateReserved": "2026-07-19T15:36:31.787Z",
"dateUpdated": "2026-07-25T08:51:09.688Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64435",
"date": "2026-07-26",
"epss": "0.00177",
"percentile": "0.07473"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-64435\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:27.873\",\"lastModified\":\"2026-07-25T10:17:27.873\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/audit.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/audit.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/69f98fff30bdaa72b0cb0e7e078ab6456a0a59b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ff42312ccde549f8c698723822c7db35107a39b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3d85dec60bb0622360fc176b2a51abdbe2ff0ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b35597bdae1a5d8395da4b9baa993b9b71f74d68\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5186201fa7030289cc4fe23fae87a3fcb566856\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e575dabb805252e3113fdc3f56f6ecacfde422d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe997a84a385f840b593ead92e575503a5046cee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T15:59:24Z",
"cve": "CVE-2026-64435",
"id": "CVE-2026-64435",
"initial_release_date": "2026-07-25T15:59:24Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64435",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64435.json",
"version": "2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
Loading…
Loading…