---
title: "CVE-2026-89492: Linux Kernel ocfs2 - Out-of-Bounds Read"
description: "Linux kernel ocfs2 filesystem contains an out-of-bounds read vulnerability caused by missing bounds checks on directory-index entry counts in metadata blocks, letting attackers with crafted on-disk images cause slab out-of-bounds reads during directory operations, exploit requires mounting a crafted filesystem image."
url: https://panop.io/threat-heartbeat/CVE-2026-89492/
---

# CVE-2026-89492 Linux Kernel ocfs2 - Out-of-Bounds Read

Linux kernel ocfs2 filesystem contains an out-of-bounds read vulnerability caused by missing bounds checks on directory-index entry counts in metadata blocks, letting attackers with crafted on-disk images cause slab out-of-bounds reads during directory operations, exploit requires mounting a crafted filesystem image.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.64% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89492)

## Details

Type

Out-of-Bounds Read

Impact

Information Disclosure, Denial Of Service

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 fix for commit 775c17386a6f 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-2026-89492](https://nvd.nist.gov/vuln/detail/CVE-2026-89492)
- [https://git.kernel.org/stable/c/fcfcba8fe17dbf2c8805690b8cc25e32d81249a4](https://git.kernel.org/stable/c/fcfcba8fe17dbf2c8805690b8cc25e32d81249a4)
- [https://git.kernel.org/stable/c/5e661f55ca8568471fce558effe81cca112f5cb2](https://git.kernel.org/stable/c/5e661f55ca8568471fce558effe81cca112f5cb2)
- [https://git.kernel.org/stable/c/b8a5c0c32df2c5b685ceef76ac77e37c7e1dc3ed](https://git.kernel.org/stable/c/b8a5c0c32df2c5b685ceef76ac77e37c7e1dc3ed)
- [https://git.kernel.org/stable/c/bc70726ddad53c7e9a9a85915bf2415b0d4f42f9](https://git.kernel.org/stable/c/bc70726ddad53c7e9a9a85915bf2415b0d4f42f9)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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.

[Book a demo](https://panop.io/demo)