---
title: "CVE-2026-90301: Linux kernel ocfs2 o2hb - Use After Free"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-90301/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90301)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90301](https://nvd.nist.gov/vuln/detail/CVE-2026-90301)
- [https://git.kernel.org/stable/c/011291b70ba4832e136b7b581825b2bc0f525bf6](https://git.kernel.org/stable/c/011291b70ba4832e136b7b581825b2bc0f525bf6)
- [https://git.kernel.org/stable/c/b5a2907bdeced0949bcddc84b95ba7d4cb93841b](https://git.kernel.org/stable/c/b5a2907bdeced0949bcddc84b95ba7d4cb93841b)
- [https://git.kernel.org/stable/c/9d44822ba34d6035690f725f9de602744a6e1946](https://git.kernel.org/stable/c/9d44822ba34d6035690f725f9de602744a6e1946)

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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

Panop answers these inside your environment, for this CVE and every other finding.

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