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

Vulnerability from cvelistv5 – Published: 2026-07-24 15:23 – Updated: 2026-08-05 12:40
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 CPE status
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)
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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)
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    "redhat_vex": {
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      "initial_release_date": "2026-07-24T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "50",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64219.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:08:51Z",
      "cve": "CVE-2026-64219",
      "id": "CVE-2026-64219",
      "initial_release_date": "2026-07-25T00:14:19Z",
      "product_status:known_affected": "118",
      "product_status:known_not_affected": "180",
      "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": "4"
    }
  }
}



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Tags
Taxonomy of the tags.





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

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.