---
id: CVE-2026-89821
title: "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: avoid divide-by-zero in __is_lut_linear()\n\n__is_lut_linear() computes the expected value of each entry with\n\n\texpected = i * MAX_DRM_LUT_VALUE / (size …"
summary: "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: avoid divide-by-zero in __is_lut_linear()\n\n__is_lut_linear() computes the expected value of each entry with\n\n\texpected = i * MAX_DRM_LUT_VALUE / (size …"
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    2320626425f3af3a25b8afb6876f205b1c6d4e64
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    d1e06d5dc8f12451ce71dc068342660a34476084
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    c127ace7af2b40107947a6504391f94d6fd21734
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    5f18cd1ba873e751bf5547407ad44ea34adfbe2f
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    ee28fafb50f58b847509b5240b431ddec673bdfe
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    15ee43aad0df43dfd1dbb32e7d5b951745c4b87f
  - >-
    Linux >= 086247a4b2fba49800b27807f22bb894cd8363fb <
    4f40873f8a4107df2b9c8e68c947c4fd0cd519d2
  - Linux 4.17
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:16:47.503'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89821'
references:
  - url: 'https://git.kernel.org/stable/c/15ee43aad0df43dfd1dbb32e7d5b951745c4b87f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2320626425f3af3a25b8afb6876f205b1c6d4e64'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4f40873f8a4107df2b9c8e68c947c4fd0cd519d2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f18cd1ba873e751bf5547407ad44ea34adfbe2f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c127ace7af2b40107947a6504391f94d6fd21734'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d1e06d5dc8f12451ce71dc068342660a34476084'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ee28fafb50f58b847509b5240b431ddec673bdfe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:54.003Z'
epss: 0.00211
epssPercentile: 0.10099
---

## Overview

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

drm/amd/display: avoid divide-by-zero in __is_lut_linear()

__is_lut_linear() computes the expected value of each entry with

	expected = i * MAX_DRM_LUT_VALUE / (size - 1);

If it is ever called with a single-entry LUT, size - 1 is zero and the
kernel takes a divide error (#DE). A LUT with fewer than two entries
cannot describe a linear mapping anyway, so return false early instead
of dividing by zero.

## Remediation

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