audit: avoid dropping live tree ref on fsnotify rule autoremove

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89643
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:50 UTC
Updated2026-09-11 20:19:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: audit: avoid dropping live tree ref on fsnotify rule autoremove audit_del_rule() is used for both netlink deletion templates and internal fsnotify autoremove. The former passes a parsed template which owns a temporary tree reference; the latter passes the installed entry itself. The unconditional audit_put_tree() at the end of audit_del_rule() assumes the template case. For mixed AUDIT_DIR plus AUDIT_EXE rules, an fsnotify autoremove event therefore drops the installed rule's live tree reference. Repeating this across rules sharing the same tree can free the tree while another rule still references it, and a later autoremove dereferences the freed pathname while comparing rules. Move the temporary-tree put to audit_rule_change(), the caller that owns deletion templates. Keep it in the AUDIT_DEL_RULE cleanup so both successful deletion and -ENOENT still release the parser-owned tree. [PM: dropped unnecessary comment for line length reasons]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28 git Not specified
CNA Linux Linux affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc 636a99bab36ba27515363d325866c0273ac83b3e git Not specified
CNA Linux Linux affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc 583cf579b32d99e3fe4e9c8ecc4d852e3708fbec git Not specified
CNA Linux Linux affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc 783f0f0974c156aca630f4ffff248671082a098d git Not specified
CNA Linux Linux affected 4.3 Not specified
CNA Linux Linux unaffected 4.3 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/636a99bab36ba27515363d325866c0273ac83b3e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/783f0f0974c156aca630f4ffff248671082a098d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/583cf579b32d99e3fe4e9c8ecc4d852e3708fbec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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