CVE-2026-89643audit: avoid dropping live tree ref on fsnotify rule autoremove
- 9.8CriticalCVSS base score
- 0.71%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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]
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.71% · top 46% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < 9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < b322cc7adcd2e6ec1594d187533a126506ab545c
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < 695c85dc345a4e0292739f004c261bedef3f27e6
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < 01b0ec8c397be65ff710777c97017ca1de56ef8e
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < 636a99bab36ba27515363d325866c0273ac83b3e
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < 583cf579b32d99e3fe4e9c8ecc4d852e3708fbec
- affected 34d99af52ad40bd498ba66970579a5bc1fb1a3bc – < 783f0f0974c156aca630f4ffff248671082a098d
- affected 4.3
- unaffected < 4.3
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58 (opens in a new tab)
- https://git.kernel.org/stable/c/b322cc7adcd2e6ec1594d187533a126506ab545c (opens in a new tab)
- https://git.kernel.org/stable/c/695c85dc345a4e0292739f004c261bedef3f27e6 (opens in a new tab)
- https://git.kernel.org/stable/c/01b0ec8c397be65ff710777c97017ca1de56ef8e (opens in a new tab)
- https://git.kernel.org/stable/c/cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28 (opens in a new tab)
- https://git.kernel.org/stable/c/636a99bab36ba27515363d325866c0273ac83b3e (opens in a new tab)
- https://git.kernel.org/stable/c/583cf579b32d99e3fe4e9c8ecc4d852e3708fbec (opens in a new tab)
- https://git.kernel.org/stable/c/783f0f0974c156aca630f4ffff248671082a098d (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76555 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89643)Record last updated .