CVE-2026-64219 (GCVE-0-2026-64219)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:23 – Updated: 2026-07-27 04:58
VLAI
Title
drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
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)
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 , < d6590e3f766e3111dd1beaf88b9384d117acfa6b (git)
Affected: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 , < 16a5fa57565afb6bf37e18129921c270c93d8e2b (git)
Affected: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 , < 90c398e822ca76e40548df0c061dd4f93ea92d71 (git)
Affected: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 , < 3265f3ed373fb8048be713aadcdf702579a0e53d (git)
Affected: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 , < 1ecde19bfce6535bffddad1139ff466b6d401b8e (git)
Affected: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 , < 1c8c6e912f2945b2a3e669afca6b52174b88e86e (git)
Affected: 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 , < 6c92f6d9600efa3ef0d9e560a2b52776d9803c29 (git)
Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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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    "datePublished": "2026-07-24T15:23:06.379Z",
    "dateReserved": "2026-07-19T15:36:31.770Z",
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    "state": "PUBLISHED"
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      "status": "final",
      "title": "drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64219.json",
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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)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/amd/display/dc/core/dc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\"lessThan\":\"d6590e3f766e3111dd1beaf88b9384d117acfa6b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\"lessThan\":\"16a5fa57565afb6bf37e18129921c270c93d8e2b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\"lessThan\":\"90c398e822ca76e40548df0c061dd4f93ea92d71\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\"lessThan\":\"3265f3ed373fb8048be713aadcdf702579a0e53d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\"lessThan\":\"1ecde19bfce6535bffddad1139ff466b6d401b8e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\"lessThan\":\"1c8c6e912f2945b2a3e669afca6b52174b88e86e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\"lessThan\":\"6c92f6d9600efa3ef0d9e560a2b52776d9803c29\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/amd/display/dc/core/dc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T00:14:19Z",
      "cve": "CVE-2026-64219",
      "id": "CVE-2026-64219",
      "initial_release_date": "2026-07-25T00:14:19Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64219",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64219.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
  • 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.