CVE-2026-90301 Linux kernel ocfs2 o2hb - Use After Free

Linux kernel ocfs2 o2hb contains a use-after-free vulnerability caused by improper lifecycle management of heartbeat region handlers and delayed works, letting attackers cause memory corruption or kernel crash, exploit requires local code execution or specific kernel interaction.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.45% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for this issue.

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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