CVE-2026-89495 Linux Kernel ocfs2 - Out-of-Bounds Write & Read

Linux kernel ocfs2 contains a heap out-of-bounds write caused by unbounded peer-controlled length fields in dlm_migrate_request_handler and related handlers, letting any node in a DLM domain corrupt or panic other nodes, exploit requires attacker to be a member of the cluster.

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 Write
Impact
Denial Of Service, Data Tampering
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 ocfs2/dlm patch that bounds peer-controlled lengths in o2dlm handlers.

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

← All CVEs