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Review reviewHigh

CVE-2026-64219

Linux

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 w...

CVSS
7
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7

Vulnerability overview

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 w...

Affected product and versions

Product
Linux
Affected versions
>= 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 < d6590e3f766e3111dd1beaf88b9384d117acfa6b, >= 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 < 16a5fa57565afb6bf37e18129921c270c93d8e2b, >= 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 < 90c398e822ca76e40548df0c061dd4f93ea92d71, >= 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 < 3265f3ed373fb8048be713aadcdf702579a0e53d, >= 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 < 1ecde19bfce6535bffddad1139ff466b6d401b8e, >= 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 < 1c8c6e912f2945b2a3e669afca6b52174b88e86e, >= 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 < 6c92f6d9600efa3ef0d9e560a2b52776d9803c29, >= 5.13
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-64219 — Linux | SECUFOCUS NOW