CVE-2026-90320 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in ocfs2 external xattr metadata handling caused by insufficient validation of xattr block headers, letting attackers cause memory corruption or kernel crash, exploit requires crafted external xattr metadata.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.17% 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:L/AC:L/PR:N/UI:R/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 ocfs2 xattr 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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