CVE-2026-89494 Linux Kernel ocfs2 - Out-of-Bounds Read & Write

Linux kernel ocfs2 contains an out-of-bounds read and heap out-of-bounds write caused by unvalidated num_locks and lockname_len fields in dlm_mig_lockres_handler, letting any node in the domain cause a kernel panic or memory corruption, exploit requires network access within the domain.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.71% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Read
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for dlm_mig_lockres_handler validation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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