drm/panthor: fix firmware control interface bounds checks

{
  "id": "339428ef65bc4c7f44f954d2071d2192bb9ec9700617ef0cb3a5a1d8d3995d88",
  "url": "https://osv.dev/vulnerability/CVE-2026-89825",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/panthor: fix firmware control interface bounds checks",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/panthor: fix firmware control interface bounds checks panthor_init_cs_iface() and panthor_init_csg_iface() validate firmware control interface offsets with 32-bit arithmetic and the size of the host wrapper structures. The offsets are derived from firmware-provided strides, so the arithmetic can wrap before the bounds check, and the host wrapper size is not the size of the firmware control interface being mapped. Use 64-bit arithmetic for the computed offsets and validate against the actual firmware control interface structure sizes with subtraction-based bounds checks. Also validate that the shared section is large enough for the global control interface before using it.",
    "evidence": "osv:CVE-2026-89825",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.51",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-89825",
      "aliases": [
        "CVE-2026-89825"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "6a47f9fd2d970674ed9dedc52fc7ab76fd015785"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89825.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.10.0"
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            {
              "type": "ECOSYSTEM",
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                  "fixed": "6.18.51"
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            {
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89825.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.810058792Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/33ae55809aee9b4dca1d00cdee35b527f2bf8626",
        "https://git.kernel.org/stable/c/3e5c7cddc0073eef6f9bb373189b11a969f1f6f6",
        "https://git.kernel.org/stable/c/6a47f9fd2d970674ed9dedc52fc7ab76fd015785",
        "https://git.kernel.org/stable/c/80c9528661c774f899281c9a72011208ff39929e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89825.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89825",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89825.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89825",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518486,
  "published_at": "2026-09-16T10:30:57.497+00:00"
}