GHSA-GJFP-5CFR-XP55

Vulnerability from github – Published: 2026-07-24 18:31 – Updated: 2026-07-27 06:30
VLAI
Details

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)

Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64219"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-24T16:16:49Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-gjfp-5cfr-xp55",
  "modified": "2026-07-27T06:30:30Z",
  "published": "2026-07-24T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64219"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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