---
title: "CVE-2026-89495: Linux Kernel ocfs2 - Out-of-Bounds Write & Read"
description: "Linux kernel ocfs2 contains a heap out-of-bounds write caused by unbounded peer-controlled length fields in dlm_migrate_request_handler and related handlers, letting any node in a DLM domain corrupt or panic other nodes, exploit requires attacker to be a member of the cluster."
url: https://panop.io/threat-heartbeat/CVE-2026-89495/
---

# CVE-2026-89495 Linux Kernel ocfs2 - Out-of-Bounds Write & Read

Linux kernel ocfs2 contains a heap out-of-bounds write caused by unbounded peer-controlled length fields in dlm\_migrate\_request\_handler and related handlers, letting any node in a DLM domain corrupt or panic other nodes, exploit requires attacker to be a member of the cluster.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.71% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89495)

## Details

Type

Out-of-Bounds Write

Impact

Denial Of Service, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the ocfs2/dlm patch that bounds peer-controlled lengths in o2dlm handlers.

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-2026-89495](https://nvd.nist.gov/vuln/detail/CVE-2026-89495)
- [https://git.kernel.org/stable/c/24989909d3413b44b104102caa6661b1e424ba0f](https://git.kernel.org/stable/c/24989909d3413b44b104102caa6661b1e424ba0f)
- [https://git.kernel.org/stable/c/aabc5d8388e6f8826345f0073455dbcaaaa6491d](https://git.kernel.org/stable/c/aabc5d8388e6f8826345f0073455dbcaaaa6491d)
- [https://git.kernel.org/stable/c/e1288865b8ceac0dcd1009ecba43de961f13d5bd](https://git.kernel.org/stable/c/e1288865b8ceac0dcd1009ecba43de961f13d5bd)
- [https://git.kernel.org/stable/c/2487bea2098322669f0563baff53e797486b823f](https://git.kernel.org/stable/c/2487bea2098322669f0563baff53e797486b823f)
- [https://git.kernel.org/stable/c/de10cd3b062a5235af754925fcf49beb5a1109d4](https://git.kernel.org/stable/c/de10cd3b062a5235af754925fcf49beb5a1109d4)
- [https://git.kernel.org/stable/c/ea5b5609305a8437bc955a0834a530c12246d78f](https://git.kernel.org/stable/c/ea5b5609305a8437bc955a0834a530c12246d78f)
- [https://git.kernel.org/stable/c/f8658ee3327f73bd81c0bcd07cdeb5a8527fac98](https://git.kernel.org/stable/c/f8658ee3327f73bd81c0bcd07cdeb5a8527fac98)
- [https://git.kernel.org/stable/c/006c96ea488eca2ef5155ec76038e0a4dbf65f0a](https://git.kernel.org/stable/c/006c96ea488eca2ef5155ec76038e0a4dbf65f0a)

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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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