lockd: pin next file across nlm_inspect_file lock-drop

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89485
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:30 UTC
Updated2026-09-11 20:19:30 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 c24bdb7df2f34bdc38ca8a73796f5acb40f1830c git Not specified
CNA Linux Linux affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 41f0a6d31615fcae261bf28a0aa50050dc93a401 git Not specified
CNA Linux Linux affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 e999a88133654c6dfc68487fb49da5f20dfa2d4f git Not specified
CNA Linux Linux affected 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 526c49cff3f72c3ec74752016380c7567040581b git Not specified
CNA Linux Linux affected 2.6.18 Not specified
CNA Linux Linux unaffected 2.6.18 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/526c49cff3f72c3ec74752016380c7567040581b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401 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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