CVE-2026-89485lockd: pin next file across nlm_inspect_file lock-drop
- 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: lockd: pin next file across nlm_inspect_file lock-drop nlm_traverse_files() pins the current file with f_count++ across a mutex_unlock for nlm_inspect_file(), but nothing pins the saved next pointer. A concurrent nlm_release_file() can kfree the next file during the unlock window, and the iterator dereferences freed memory on the next loop step. Pin both current and next before the lock-drop. Advance by swapping the pinned cursors at the end of each iteration so next is always held alive across the unlock. Always call nlm_file_release() after dropping the iteration pin, regardless of whether the file matched the predicate. Use nlm_file_inuse(), which does a live walk of the inode lock list, rather than the cached f_locks field, so skipped files that never ran nlm_inspect_file() are evaluated correctly. Because every file in a hash bucket is now pinned and released, files skipped by the is_failover_file predicate that have no locks, blocks, shares, or external references are deleted during traversal. The old code never evaluated skipped files for cleanup. The new behavior is intentional: such files are stale and should not persist in the table.
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 (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < e3c413f789eaf0170275c7eba523ead73d963f30
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < 08a455f87b14c7ff22ae3fdadda62a796a3a5572
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < 550c19222c7132c888e23c9d89079ba1c9bc4cca
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < 350087f231c11efcd288c310707c40eab63ca583
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < c24bdb7df2f34bdc38ca8a73796f5acb40f1830c
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < 41f0a6d31615fcae261bf28a0aa50050dc93a401
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < e999a88133654c6dfc68487fb49da5f20dfa2d4f
- affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 – < 526c49cff3f72c3ec74752016380c7567040581b
- affected 2.6.18
- unaffected < 2.6.18
- 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/e3c413f789eaf0170275c7eba523ead73d963f30 (opens in a new tab)
- https://git.kernel.org/stable/c/08a455f87b14c7ff22ae3fdadda62a796a3a5572 (opens in a new tab)
- https://git.kernel.org/stable/c/550c19222c7132c888e23c9d89079ba1c9bc4cca (opens in a new tab)
- https://git.kernel.org/stable/c/350087f231c11efcd288c310707c40eab63ca583 (opens in a new tab)
- https://git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c (opens in a new tab)
- https://git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401 (opens in a new tab)
- https://git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f (opens in a new tab)
- https://git.kernel.org/stable/c/526c49cff3f72c3ec74752016380c7567040581b (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-2026-76391 (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-2026-89485)Record last updated .