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CVE-2026-89494

ocfs2: validate lengths in dlm_mig_lockres_handler

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in 4a5798253212093b9ff7d90c6cfbe348bcda1594; From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in dce05b17db862f47ff60614017abe639b2e71cad; From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in 0e999d56917f861f97adb961617b1828c9eb4733; From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in 77686fa5bba135252d348e2dacf481fc19f60c41; From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in f33041906885f96e190cde54e61ddc69de39e3ee; From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in 50c4cc9183e11f83427efbf770f54851f4471c02; From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in a8facb1670b4a0612183198e758d9539ef628ed9; From 6714d8e86bf443f6f7af50f9d432025649f091f5 · fixed in b54e03d9b3697d25f4a0063cf717d459c5e3ad94

  • Linux Linux

    2.6.16

  • KernelLinux

    From 2.6.16 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 8

git.kernel.org