---
title: "CVE-2026-89819: Linux Kernel - Out-of-Bounds Read & Denial of Service"
description: "Linux kernel drm/amd/display contains an out-of-bounds read and divide-by-zero vulnerability caused by lack of validation of plane degamma LUT size in __set_dm_plane_degamma, letting attackers trigger memory corruption, exploit requires malformed AMD_PLANE_DEGAMMA_LUT input."
url: https://panop.io/threat-heartbeat/CVE-2026-89819/
---

# CVE-2026-89819 Linux Kernel - Out-of-Bounds Read & Denial of Service

Linux kernel drm/amd/display contains an out-of-bounds read and divide-by-zero vulnerability caused by lack of validation of plane degamma LUT size in \_\_set\_dm\_plane\_degamma, letting attackers trigger memory corruption, exploit requires malformed AMD\_PLANE\_DEGAMMA\_LUT input.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89819)

## Details

Type

Out-of-Bounds Read

Impact

Denial Of Service

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for plane degamma LUT size validation.

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-2026-89819](https://nvd.nist.gov/vuln/detail/CVE-2026-89819)
- [https://git.kernel.org/stable/c/0b2615b8b54f58bbdf986dffb38cbc35214a5cc5](https://git.kernel.org/stable/c/0b2615b8b54f58bbdf986dffb38cbc35214a5cc5)
- [https://git.kernel.org/stable/c/b10cc09b329245c6d95f8fa3e7f068575e3e0e9f](https://git.kernel.org/stable/c/b10cc09b329245c6d95f8fa3e7f068575e3e0e9f)
- [https://git.kernel.org/stable/c/e4c3ab59021e7c146a84b6671f0d530972bd58b4](https://git.kernel.org/stable/c/e4c3ab59021e7c146a84b6671f0d530972bd58b4)
- [https://git.kernel.org/stable/c/f6f04d8ae5725bcc893bdc62e3467efd97255c5b](https://git.kernel.org/stable/c/f6f04d8ae5725bcc893bdc62e3467efd97255c5b)

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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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