CVE-2026-90321 Linux Kernel OCFS2 - Use After Free

Linux kernel OCFS2 filesystem contains a use-after-free vulnerability caused by lack of inline xattr entry bounds validation during inode block validation, letting local attackers cause memory corruption, exploit requires access to OCFS2 filesystem with crafted metadata.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
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 Linux kernel version including patch series "ocfs2: validate xattr entry bounds" v7 or later

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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