{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "086247a4b2fba49800b27807f22bb894cd8363fb"
            },
            {
              "fixed": "2320626425f3af3a25b8afb6876f205b1c6d4e64"
            },
            {
              "fixed": "d1e06d5dc8f12451ce71dc068342660a34476084"
            },
            {
              "fixed": "c127ace7af2b40107947a6504391f94d6fd21734"
            },
            {
              "fixed": "4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44"
            },
            {
              "fixed": "5f18cd1ba873e751bf5547407ad44ea34adfbe2f"
            },
            {
              "fixed": "ee28fafb50f58b847509b5240b431ddec673bdfe"
            },
            {
              "fixed": "15ee43aad0df43dfd1dbb32e7d5b951745c4b87f"
            },
            {
              "fixed": "4f40873f8a4107df2b9c8e68c947c4fd0cd519d2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.17.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89821.json"
  },
  "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": "CVE-2026-89821",
  "modified": "2026-09-18T03:30:46.809725671Z",
  "published": "2026-09-16T10:30:53.689Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89821.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89821"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "drm/amd/display: avoid divide-by-zero in __is_lut_linear()"
}