CVE-2026-89821 (GCVE-0-2026-89821)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:53
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 086247a4b2fba49800b27807f22bb894cd8363fb
Version: 086247a4b2fba49800b27807f22bb894cd8363fb
Version: 086247a4b2fba49800b27807f22bb894cd8363fb
Version: 086247a4b2fba49800b27807f22bb894cd8363fb
Version: 086247a4b2fba49800b27807f22bb894cd8363fb
Version: 086247a4b2fba49800b27807f22bb894cd8363fb
Version: 086247a4b2fba49800b27807f22bb894cd8363fb
Version: 086247a4b2fba49800b27807f22bb894cd8363fb
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.270",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.51",
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              "version": "7.2.5",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.17",
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              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:53:15.267Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2320626425f3af3a25b8afb6876f205b1c6d4e64"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1e06d5dc8f12451ce71dc068342660a34476084"
        },
        {
          "url": "https://git.kernel.org/stable/c/c127ace7af2b40107947a6504391f94d6fd21734"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f18cd1ba873e751bf5547407ad44ea34adfbe2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee28fafb50f58b847509b5240b431ddec673bdfe"
        },
        {
          "url": "https://git.kernel.org/stable/c/15ee43aad0df43dfd1dbb32e7d5b951745c4b87f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f40873f8a4107df2b9c8e68c947c4fd0cd519d2"
        }
      ],
      "title": "drm/amd/display: avoid divide-by-zero in __is_lut_linear()",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89821",
    "datePublished": "2026-09-16T10:30:53.689Z",
    "dateReserved": "2026-09-11T19:38:34.768Z",
    "dateUpdated": "2026-10-19T08:53:15.267Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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