audit: Fix data races of skb_queue_len() readers on audit_queue
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
CVE-2026-64435
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64435
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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"
}
]- Related CVEs
- CVE-2026-64435
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41042 · Revision 1
- Added to Heist Feed
- Publisher date