{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53138",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53138"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "drm/amd/display: Bound VBIOS record-chain walk loops",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Bound VBIOS record-chain walk loops\n\n[Why & How]\nAll record-chain walk loops in bios_parser.c and bios_parser2.c use\nfor(;;) and only terminate on a 0xFF record_type sentinel or zero\nrecord_size. A malformed VBIOS image missing the terminator record\ncauses unbounded iteration at probe time, potentially hundreds of\nthousands of iterations with record_size=1. In the final iterations\nnear the BIOS image boundary, struct casts beyond the 2-byte header\nvalidated by GET_IMAGE can also read out of bounds.\n\nCap all 14 record-chain walk loops to BIOS_MAX_NUM_RECORD (256)\niterations. The atombios.h defines up to 22 distinct record types\nand atomfirmware.h has 13. Assuming an average of less than 10\nrecords per type (which is reasonable since most are connector-\nbased) 256 is a generous upper bound.\n\n(cherry picked from commit 95700a3d660287ed657d6892f7be9ffc0e294a93)",
  "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": "6.1.177",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53138"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e94f5323c41f32a74160378c3b19850d1f203ad5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/04e271a952b8863bbafc99bd51aca4c32bff0e0d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6723188c42ca3b34a9fce634d7a0ecc9ccd5cd56"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/499c6b43a79dd684bddbd18fe8b2235aa2764db4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6173cfea2f916e01c4f98e29cd654384a05e32a3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2645e3caf7e013189da9c6ff621d006cca5a538b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ff287df16a1a58aca78b08d1f3ee09fc44da0351"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-04T11:51:32Z"
  }
}