CVE-2026-89494ocfs2: validate lengths in dlm_mig_lockres_handler
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 6714d8e86bf443f6f7af50f9d432025649f091f5 builds before 4a5798253212093b9ff7d90c6cfbe348bcda1594; from 6714d8e86bf443f6f7af50f9d432025649f091f5 before dce05b17db862f47ff60614017abe639b2e71cad; 6714d8e86bf443f6f7af50f9d432025649f091f5 builds before 0e999d56917f861f97adb961617b1828c9eb4733; from 6714d8e86bf443f6f7af50f9d432025649f091f5 before 77686fa5bba135252d348e2dacf481fc19f60c41; from 6714d8e86bf443f6f7af50f9d432025649f091f5 before f33041906885f96e190cde54e61ddc69de39e3ee; 6714d8e86bf443f6f7af50f9d432025649f091f5 builds before 50c4cc9183e11f83427efbf770f54851f4471c02; from 6714d8e86bf443f6f7af50f9d432025649f091f5 before a8facb1670b4a0612183198e758d9539ef628ed9; from 6714d8e86bf443f6f7af50f9d432025649f091f5 before b54e03d9b3697d25f4a0063cf717d459c5e3ad94 | CNA record |
References
- https://git.kernel.org/stable/c/4a5798253212093b9ff7d90c6cfbe348bcda1594
- https://git.kernel.org/stable/c/dce05b17db862f47ff60614017abe639b2e71cad
- https://git.kernel.org/stable/c/0e999d56917f861f97adb961617b1828c9eb4733
- https://git.kernel.org/stable/c/77686fa5bba135252d348e2dacf481fc19f60c41
- https://git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee
- https://git.kernel.org/stable/c/50c4cc9183e11f83427efbf770f54851f4471c02
- https://git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9
- https://git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.