CVE-2026-89643 (GCVE-0-2026-89643)
Vulnerability from cvelistv5
Published
2026-09-11 19:45
Modified
2026-10-19 08:50
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In 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]
References
Impacted products
Vendor Product Version
Linux Linux Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
Version: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc
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  • 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.