drm/panthor: harden firmware build-info bounds checks

{
  "id": "f38d4726c1c0d9c601f23494c0c0583de95e3472b02e571c24d63e6f36d5d8da",
  "url": "https://osv.dev/vulnerability/CVE-2026-89826",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/panthor: harden firmware build-info bounds checks",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/panthor: harden firmware build-info bounds checks panthor_fw_read_build_info() checks whether the metadata range fits in the firmware image with hdr.meta_start + hdr.meta_size. Both fields are u32, so the addition can wrap and let an out-of-bounds range pass validation. The function also reads the \"git_sha: \" prefix without first checking that the metadata is long enough, and meta_size == 0 can underflow the NULL terminator index. Use subtraction-based bounds checking and reject metadata that is too short to contain the expected prefix and trailing NULL byte.",
    "evidence": "osv:CVE-2026-89826",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.51",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-89826",
      "aliases": [
        "CVE-2026-89826"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2718d91816eeed03c09c8abe872e45f59078768c"
                },
                {
                  "fixed": "5516f1acfd07564361cf306cc90a8e513df0f096"
                },
                {
                  "fixed": "6ae19dce3e8c13ae73590b3f4311abe9f96bbae8"
                },
                {
                  "fixed": "8321b093fa6c297b80586460ce6914d9655df170"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89826.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.18.51"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89826.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.782047147Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5516f1acfd07564361cf306cc90a8e513df0f096",
        "https://git.kernel.org/stable/c/6ae19dce3e8c13ae73590b3f4311abe9f96bbae8",
        "https://git.kernel.org/stable/c/8321b093fa6c297b80586460ce6914d9655df170",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89826.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89826",
        "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-2026-89826.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89826",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491573,
  "published_at": "2026-09-16T10:30:58.435+00:00"
}