Vulnerability-Lookup

GHSA-QC6F-VG59-3945

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-25 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Bound VBIOS record-chain walk loops

[Why & How] All record-chain walk loops in bios_parser.c and bios_parser2.c use for(;;) and only terminate on a 0xFF record_type sentinel or zero record_size. A malformed VBIOS image missing the terminator record causes unbounded iteration at probe time, potentially hundreds of thousands of iterations with record_size=1. In the final iterations near the BIOS image boundary, struct casts beyond the 2-byte header validated by GET_IMAGE can also read out of bounds.

Cap all 14 record-chain walk loops to BIOS_MAX_NUM_RECORD (256) iterations. The atombios.h defines up to 22 distinct record types and atomfirmware.h has 13. Assuming an average of less than 10 records per type (which is reasonable since most are connector- based) 256 is a generous upper bound.

(cherry picked from commit 95700a3d660287ed657d6892f7be9ffc0e294a93)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53138"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Bound VBIOS record-chain walk loops\n\n[Why \u0026 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)",
  "id": "GHSA-qc6f-vg59-3945",
  "modified": "2026-06-25T09:31:18Z",
  "published": "2026-06-25T09:31:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53138"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2645e3caf7e013189da9c6ff621d006cca5a538b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6173cfea2f916e01c4f98e29cd654384a05e32a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff287df16a1a58aca78b08d1f3ee09fc44da0351"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53138 (GCVE-0-2026-53138)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-25 08:38

Title

drm/amd/display: Bound VBIOS record-chain walk loops

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Bound VBIOS record-chain walk loops [Why & How] All record-chain walk loops in bios_parser.c and bios_parser2.c use for(;;) and only terminate on a 0xFF record_type sentinel or zero record_size. A malformed VBIOS image missing the terminator record causes unbounded iteration at probe time, potentially hundreds of thousands of iterations with record_size=1. In the final iterations near the BIOS image boundary, struct casts beyond the 2-byte header validated by GET_IMAGE can also read out of bounds. Cap all 14 record-chain walk loops to BIOS_MAX_NUM_RECORD (256) iterations. The atombios.h defines up to 22 distinct record types and atomfirmware.h has 13. Assuming an average of less than 10 records per type (which is reasonable since most are connector- based) 256 is a generous upper bound. (cherry picked from commit 95700a3d660287ed657d6892f7be9ffc0e294a93)

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/6173cfea2f916e01c…
https://git.kernel.org/stable/c/0e56f460bddb397fa…
https://git.kernel.org/stable/c/2645e3caf7e013189…
https://git.kernel.org/stable/c/ff287df16a1a58aca…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 6173cfea2f916e01c4f98e29cd654384a05e32a3 (git) Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1 (git) Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 2645e3caf7e013189da9c6ff621d006cca5a538b (git) Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < ff287df16a1a58aca78b08d1f3ee09fc44da0351 (git)
Linux	Linux	Affected: 4.15 Unaffected: 0 , < 4.15 (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/bios/bios_parser.c",
            "drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c",
            "drivers/gpu/drm/amd/display/dc/bios/bios_parser_helper.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6173cfea2f916e01c4f98e29cd654384a05e32a3",
              "status": "affected",
              "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c",
              "versionType": "git"
            },
            {
              "lessThan": "0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1",
              "status": "affected",
              "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c",
              "versionType": "git"
            },
            {
              "lessThan": "2645e3caf7e013189da9c6ff621d006cca5a538b",
              "status": "affected",
              "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c",
              "versionType": "git"
            },
            {
              "lessThan": "ff287df16a1a58aca78b08d1f3ee09fc44da0351",
              "status": "affected",
              "version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/bios/bios_parser.c",
            "drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c",
            "drivers/gpu/drm/amd/display/dc/bios/bios_parser_helper.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.94",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Bound VBIOS record-chain walk loops\n\n[Why \u0026 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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:38:26.859Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6173cfea2f916e01c4f98e29cd654384a05e32a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1"
        },
        {
          "url": "https://git.kernel.org/stable/c/2645e3caf7e013189da9c6ff621d006cca5a538b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff287df16a1a58aca78b08d1f3ee09fc44da0351"
        }
      ],
      "title": "drm/amd/display: Bound VBIOS record-chain walk loops",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53138",
    "datePublished": "2026-06-25T08:38:26.859Z",
    "dateReserved": "2026-06-09T07:44:35.387Z",
    "dateUpdated": "2026-06-25T08:38:26.859Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-QC6F-VG59-3945

CVE-2026-53138 (GCVE-0-2026-53138)

Tags

Sightings

Nomenclature