Vulnerability-Lookup

GHSA-4RRM-WVMV-QHX6

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89821"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:16:47Z",
    "severity": null
  },
  "details": "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 - 1);\n\nIf it is ever called with a single-entry LUT, size - 1 is zero and the\nkernel takes a divide error (#DE). A LUT with fewer than two entries\ncannot describe a linear mapping anyway, so return false early instead\nof dividing by zero.",
  "id": "GHSA-4rrm-wvmv-qhx6",
  "modified": "2026-09-16T12:30:37Z",
  "published": "2026-09-16T12:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89821"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15ee43aad0df43dfd1dbb32e7d5b951745c4b87f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2320626425f3af3a25b8afb6876f205b1c6d4e64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f40873f8a4107df2b9c8e68c947c4fd0cd519d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f18cd1ba873e751bf5547407ad44ea34adfbe2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c127ace7af2b40107947a6504391f94d6fd21734"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1e06d5dc8f12451ce71dc068342660a34476084"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee28fafb50f58b847509b5240b431ddec673bdfe"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89821 (GCVE-0-2026-89821)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:30 – Updated: 2026-09-16 10:30

Title

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

Summary

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/2320626425f3af3a2…
https://git.kernel.org/stable/c/d1e06d5dc8f12451c…
https://git.kernel.org/stable/c/c127ace7af2b40107…
https://git.kernel.org/stable/c/4d5ee095a58461b24…
https://git.kernel.org/stable/c/5f18cd1ba873e751b…
https://git.kernel.org/stable/c/ee28fafb50f58b847…
https://git.kernel.org/stable/c/15ee43aad0df43dfd…
https://git.kernel.org/stable/c/4f40873f8a4107df2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 2320626425f3af3a25b8afb6876f205b1c6d4e64 (git) Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < d1e06d5dc8f12451ce71dc068342660a34476084 (git) Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < c127ace7af2b40107947a6504391f94d6fd21734 (git) Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44 (git) Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 5f18cd1ba873e751bf5547407ad44ea34adfbe2f (git) Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < ee28fafb50f58b847509b5240b431ddec673bdfe (git) Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 15ee43aad0df43dfd1dbb32e7d5b951745c4b87f (git) Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 4f40873f8a4107df2b9c8e68c947c4fd0cd519d2 (git)
Linux	Linux	Affected: 4.17 Unaffected: 0 , < 4.17 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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GHSA-4RRM-WVMV-QHX6

CVE-2026-89821 (GCVE-0-2026-89821)

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