CVE-2026-64219 (GCVE-0-2026-64219)
Vulnerability from cvelistv5
Published
2026-07-24 15:23
Modified
2026-08-05 12:40
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
Impacted products
Vendor Product Version
Linux Linux Version: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6
Version: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6
Version: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6
Version: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6
Version: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6
Version: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6
Version: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/core/dc.c"
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              "lessThanOrEqual": "7.0.*",
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              "version": "7.0.11",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
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                {
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              "negate": false,
              "operator": "OR"
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      "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)"
        }
      ],
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        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The closest attack surface is the local DRM DisplayPort AUX character-device path; no network protocol reaches this function. Physical USB4/DisplayPort devices can initiate AUX activity but cannot directly supply the vulnerable length or index.\nAC:H - All current callers cap transactions at 16 bytes, while link_index is derived from an internally created dc_link. Exploitation therefore requires an abnormal internal caller or corrupted state that the attacker cannot directly create.\nPR:L - Reaching the relevant DRM/AUX interfaces requires local device access, but the traced path contains no administrative capability or init-namespace privilege check. Basic session or device-ACL access is therefore sufficient.\nUI:N - Once the attacker has local device access and the required abnormal state exists, the vulnerable copy or dereference executes without further victim action.\nS:U - The corruption occurs within the host kernel and does not inherently cross a separate virtualization, IOMMU, or other security authority boundary.\nC:H - A length greater than 40 can copy payload-controlled bytes beyond the 64-byte stack command and overwrite control data. Successful control-flow hijacking would permit arbitrary kernel-memory disclosure.\nI:H - The unbounded stack write can overwrite saved state and potentially enable kernel code execution; an invalid link_index can also dereference a wild pointer. This supports complete integrity impact.\nA:H - FORTIFY converts a sufficiently large copy into a kernel panic, while unfortified stack corruption, stack-canary failure, or the unchecked link dereference can cause an oops or crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:40:07.374Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b"
        },
        {
          "url": "https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71"
        },
        {
          "url": "https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29"
        }
      ],
      "title": "drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64219",
    "datePublished": "2026-07-24T15:23:06.379Z",
    "dateReserved": "2026-07-19T15:36:31.770Z",
    "dateUpdated": "2026-08-05T12:40:07.374Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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