FKIE_CVE-2026-64219

Vulnerability from fkie_nvd - Published: 2026-07-24 16:16 - Updated: 2026-07-30 15:00
Severity
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy. Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access. Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used. (cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/core/dc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d6590e3f766e3111dd1beaf88b9384d117acfa6b",
              "status": "affected",
              "version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
              "versionType": "git"
            },
            {
              "lessThan": "16a5fa57565afb6bf37e18129921c270c93d8e2b",
              "status": "affected",
              "version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
              "versionType": "git"
            },
            {
              "lessThan": "90c398e822ca76e40548df0c061dd4f93ea92d71",
              "status": "affected",
              "version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
              "versionType": "git"
            },
            {
              "lessThan": "3265f3ed373fb8048be713aadcdf702579a0e53d",
              "status": "affected",
              "version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
              "versionType": "git"
            },
            {
              "lessThan": "1ecde19bfce6535bffddad1139ff466b6d401b8e",
              "status": "affected",
              "version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
              "versionType": "git"
            },
            {
              "lessThan": "1c8c6e912f2945b2a3e669afca6b52174b88e86e",
              "status": "affected",
              "version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
              "versionType": "git"
            },
            {
              "lessThan": "6c92f6d9600efa3ef0d9e560a2b52776d9803c29",
              "status": "affected",
              "version": "4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/core/dc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async\n\n[Why\u0026How]\ndc_process_dmub_aux_transfer_async() copies payload-\u003elength bytes into a\n16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which\nis a no-op in release builds. If a caller ever passes length \u003e 16 this\nresults in a stack buffer overflow via memcpy.\n\nAdditionally, link_index is used to dereference dc-\u003elinks[] without\nbounds checking against dc-\u003elink_count, risking an out-of-bounds access.\n\nReplace the ASSERT with a hard runtime check that returns false when\npayload-\u003elength exceeds the destination buffer size, and add a bounds\ncheck for link_index before it is used.\n\n(cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)"
    }
  ],
  "id": "CVE-2026-64219",
  "lastModified": "2026-07-30T15:00:27.343",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-24T16:16:49.670",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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