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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-89494

ocfs2: validate lengths in dlm_mig_lockres_handler

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < 4a5798253212093b9ff7d90c6cfbe348bcda1594affected
  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < dce05b17db862f47ff60614017abe639b2e71cadaffected
  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < 0e999d56917f861f97adb961617b1828c9eb4733affected
  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < 77686fa5bba135252d348e2dacf481fc19f60c41affected
  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < f33041906885f96e190cde54e61ddc69de39e3eeaffected
  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < 50c4cc9183e11f83427efbf770f54851f4471c02affected
  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < a8facb1670b4a0612183198e758d9539ef628ed9affected
  • 6714d8e86bf443f6f7af50f9d432025649f091f5 to < b54e03d9b3697d25f4a0063cf717d459c5e3ad94affected

Linux Linux

Default version status: affected

  • 2.6.16affected
  • 0 to < 2.6.16unaffected
  • 5.10.270 to ≤ 5.10.*unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.109 to ≤ 6.12.*unaffected
  • 6.18.50 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References