CVE-2026-74512 (GCVE-0-2026-74512)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-19 16:38
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
audit: fix potential use-after-free in audit_del_rule()
`audit_del_rule()` destroys `e->rule.exe` via `audit_remove_mark_rule()`
before unlinking the rule from RCU-visible filter lists and waiting for a
grace period. Concurrent readers in `audit_filter()` and
`audit_filter_rules()` still dereference `e->rule.exe`, while the fsnotify
mark can be freed on an independent lifetime path. This creates a
use-after-free window during rule deletion.
Fix this by unlinking the rule from the RCU-visible lists and invoking
`synchronize_rcu()` before calling `audit_remove_mark_rule()` (and other
rule removal helpers). This ensures that all existing RCU readers have
exited the critical section before any underlying resources are destroyed.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc |
||
{
"containers": {
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"programFiles": [
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"status": "unaffected",
"version": "0",
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{
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"status": "unaffected",
"version": "5.10.265",
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{
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"status": "unaffected",
"version": "5.15.216",
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{
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"status": "unaffected",
"version": "6.1.183",
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{
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{
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{
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"status": "unaffected",
"version": "7.1.8",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
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"cpeApplicability": [
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\naudit: fix potential use-after-free in audit_del_rule()\n\n`audit_del_rule()` destroys `e-\u003erule.exe` via `audit_remove_mark_rule()`\nbefore unlinking the rule from RCU-visible filter lists and waiting for a\ngrace period. Concurrent readers in `audit_filter()` and\n`audit_filter_rules()` still dereference `e-\u003erule.exe`, while the fsnotify\nmark can be freed on an independent lifetime path. This creates a\nuse-after-free window during rule deletion.\n\nFix this by unlinking the rule from the RCU-visible lists and invoking\n`synchronize_rcu()` before calling `audit_remove_mark_rule()` (and other\nrule removal helpers). This ensures that all existing RCU readers have\nexited the critical section before any underlying resources are destroyed."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Reachable only via local NETLINK_AUDIT (AUDIT_DEL_RULE) or filesystem events that autoremove AUDIT_EXE rules; concurrent UAF readers run in syscall/io_uring exit audit filtering on the local host, not from remote network input.\nAC:L - The attacker controls both sides of the race by deleting an AUDIT_EXE rule (auditctl or deleting/moving the audited executable) while driving concurrent syscall/io_uring activity to keep RCU readers in audit_filter()/audit_filter_rules().\nPR:L - Besides CAP_AUDIT_CONTROL netlink deletion, unprivileged local users can trigger audit_del_rule() via fsnotify autoremove when deleting/moving an admin-configured audited executable they can write, without init-namespace root.\nUI:N - Exploitation requires no victim interaction; the attacker schedules rule deletion and concurrent audited syscalls/io_uring exits to hit the UAF window.\nS:U - Impact is kernel heap memory corruption and local privilege escalation within the host kernel security domain, not a documented cross-VM or IOMMU boundary escape.\nC:H - Use-after-free of audit_fsnotify_mark while audit_exe_compare()/audit_mark_compare() dereference mark-\u003eino/dev enables arbitrary kernel memory reads and info disclosure primitives.\nI:H - Freed fsnotify mark objects can be reallocated and corrupted to obtain arbitrary kernel writes, control-flow hijack, and local root code execution beyond audit rule deletion.\nA:H - Concurrent dereference of a freed audit_fsnotify_mark during audit filtering can immediately oops/panic the kernel; repeated triggering yields reliable denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:38:09.879Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/93616c567469510b7bba55b2674e0c4523fd7e64"
},
{
"url": "https://git.kernel.org/stable/c/3f82927b399d7a276c0c12b6ff4424b747a0c9a7"
},
{
"url": "https://git.kernel.org/stable/c/8ae135a8962be9d4e8a131eb18eb06cdf02a47ce"
},
{
"url": "https://git.kernel.org/stable/c/45bf3df5b32e5a49953e7ceabc55f7dd85380e46"
},
{
"url": "https://git.kernel.org/stable/c/78bde7e9bd36eaae1b8e8cfcd47f12a34f301dbf"
},
{
"url": "https://git.kernel.org/stable/c/cae0dfed5d307b240bff71c3cf206652d1b6f215"
},
{
"url": "https://git.kernel.org/stable/c/5b8f46864f06d6dbacb7dcea52bc084dfd122638"
},
{
"url": "https://git.kernel.org/stable/c/246df90b5f1a8a6e6abbd2f058b029558720adec"
}
],
"title": "audit: fix potential use-after-free in audit_del_rule()",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74512",
"datePublished": "2026-08-15T12:27:33.736Z",
"dateReserved": "2026-08-15T05:44:03.909Z",
"dateUpdated": "2026-08-19T16:38:09.879Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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