---
title: "CVE-2026-90321: Linux Kernel OCFS2 - Use After Free"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-90321/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90321)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90321](https://nvd.nist.gov/vuln/detail/CVE-2026-90321)
- [https://git.kernel.org/stable/c/3fd45b24879fa4885b66a582a6e47eda67f11310](https://git.kernel.org/stable/c/3fd45b24879fa4885b66a582a6e47eda67f11310)
- [https://git.kernel.org/stable/c/8914a3330b72378136c2c02d6328a826f6abdad7](https://git.kernel.org/stable/c/8914a3330b72378136c2c02d6328a826f6abdad7)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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