ocfs2: validate lengths in dlm_mig_lockres_handler

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89494
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:31 UTC
Updated2026-09-11 20:19:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ocfs2: validate lengths in dlm_mig_lockres_handler A node receiving a DLM_MIG_LOCKRES message trusts several fields of the peer-supplied dlm_migratable_lockres without validation. num_locks and lockname_len are bounded only on the sending side, and the message is never checked to actually carry num_locks migratable_lock entries. As a result dlm_process_recovery_data() walks mres->ml[0..num_locks) past the kmalloc(data_len) copy of the message (an out-of-bounds read that ends in a BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the fixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write). Both are reachable by any node in the domain. Validate these fields right after dlm_grab(), before anything uses them -- including the not-joined error path, which already prints mres->lockname with the unbounded lockname_len as a %.*s precision. Reject the message unless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <= DLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the payload is large enough to hold the claimed locks. Conforming recovery and migration messages are unaffected.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6714d8e86bf443f6f7af50f9d432025649f091f5 f33041906885f96e190cde54e61ddc69de39e3ee git Not specified
CNA Linux Linux affected 6714d8e86bf443f6f7af50f9d432025649f091f5 50c4cc9183e11f83427efbf770f54851f4471c02 git Not specified
CNA Linux Linux affected 6714d8e86bf443f6f7af50f9d432025649f091f5 a8facb1670b4a0612183198e758d9539ef628ed9 git Not specified
CNA Linux Linux affected 6714d8e86bf443f6f7af50f9d432025649f091f5 b54e03d9b3697d25f4a0063cf717d459c5e3ad94 git Not specified
CNA Linux Linux affected 2.6.16 Not specified
CNA Linux Linux unaffected 2.6.16 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/50c4cc9183e11f83427efbf770f54851f4471c02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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