---
title: "CVE-2026-89954: Linux kernel mtd:afs - Out of Bounds Read/Write"
description: "Linux kernel mtd:afs contains a buffer validation vulnerability caused by unchecked image information offset and region count in the AFS v2 parser, letting attackers cause memory corruption, exploit requires crafted flash contents."
url: https://panop.io/threat-heartbeat/CVE-2026-89954/
---

# CVE-2026-89954 Linux kernel mtd:afs - Out of Bounds Read/Write

Linux kernel mtd:afs contains a buffer validation vulnerability caused by unchecked image information offset and region count in the AFS v2 parser, letting attackers cause memory corruption, exploit requires crafted flash contents.

CVSS base score 8.0 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.19% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89954)

## Details

Type

Out of Bounds Read/Write

Impact

Denial Of Service, Remote Code Execution

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

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-2026-89954](https://nvd.nist.gov/vuln/detail/CVE-2026-89954)
- [https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348](https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348)
- [https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0](https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0)
- [https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7](https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7)
- [https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773](https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773)
- [https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7](https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7)
- [https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53](https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53)
- [https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4](https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4)
- [https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72](https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72)

[← 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)