---
id: CVE-2026-89819
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: validate plane degamma LUT size for private color prop

  Unlike the CRTC degamma path, which is guarded by
  amdgpu_dm_verify_lut_sizes(), the per-plane d…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: validate plane degamma LUT size for private color prop

  Unlike the CRTC degamma path, which is guarded by
  amdgpu_dm_verify_lut_sizes(), the per-plane d…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c <
    f6f04d8ae5725bcc893bdc62e3467efd97255c5b
  - >-
    Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c <
    0b2615b8b54f58bbdf986dffb38cbc35214a5cc5
  - >-
    Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c <
    b10cc09b329245c6d95f8fa3e7f068575e3e0e9f
  - >-
    Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c <
    e4c3ab59021e7c146a84b6671f0d530972bd58b4
  - Linux 6.8
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:11.173'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89819'
references:
  - url: 'https://git.kernel.org/stable/c/0b2615b8b54f58bbdf986dffb38cbc35214a5cc5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b10cc09b329245c6d95f8fa3e7f068575e3e0e9f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e4c3ab59021e7c146a84b6671f0d530972bd58b4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f6f04d8ae5725bcc893bdc62e3467efd97255c5b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:54.003Z'
epss: 0.00175
epssPercentile: 0.06196
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: validate plane degamma LUT size for private color prop

Unlike the CRTC degamma path, which is guarded by
amdgpu_dm_verify_lut_sizes(), the per-plane degamma LUT size was never
validated before use. __set_dm_plane_degamma() passed the user-supplied
size straight into __is_lut_linear() and, for a non-linear LUT, into
__set_input_tf() -> __drm_lut_to_dc_gamma(), the latter always iterating
MAX_COLOR_LUT_ENTRIES entries regardless of the actual LUT size.

A malformed AMD_PLANE_DEGAMMA_LUT blob (e.g. a single entry) could thus
trigger a divide-by-zero in __is_lut_linear() or an out-of-bounds read in
__drm_lut_to_dc_gamma(). Reject any plane degamma LUT whose size does not
match MAX_COLOR_LUT_ENTRIES, mirroring the invariant the code already
asserts a few lines below (and which the CRTC path enforces).

The AMD_PLANE_DEGAMMA_LUT property is only exposed on builds with
AMD_PRIVATE_COLOR defined.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.