{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89821",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-89821"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "drm/amd/display: avoid divide-by-zero in __is_lut_linear()",
  "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.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89821"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2320626425f3af3a25b8afb6876f205b1c6d4e64"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d1e06d5dc8f12451ce71dc068342660a34476084"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c127ace7af2b40107947a6504391f94d6fd21734"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5f18cd1ba873e751bf5547407ad44ea34adfbe2f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ee28fafb50f58b847509b5240b431ddec673bdfe"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15ee43aad0df43dfd1dbb32e7d5b951745c4b87f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4f40873f8a4107df2b9c8e68c947c4fd0cd519d2"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T10:32:03Z"
  }
}