CVE-2026-90205 Linux Kernel OCFS2 - Use After Free

Linux kernel OCFS2 contains a use-after-free vulnerability caused by lack of validation of active orphan slots during inode read, letting attackers cause out-of-bounds memory access, exploit requires corrupted dinode with OCFS2_ORPHANED_FL flag.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.18% 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 latest Linux kernel version containing the patch that validates active orphan slots during inode read.

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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