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CVE-2026-64219

drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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)

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 · fixed in d6590e3f766e3111dd1beaf88b9384d117acfa6b; From 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 · fixed in 16a5fa57565afb6bf37e18129921c270c93d8e2b; From 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 · fixed in 90c398e822ca76e40548df0c061dd4f93ea92d71; From 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 · fixed in 3265f3ed373fb8048be713aadcdf702579a0e53d; From 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 · fixed in 1ecde19bfce6535bffddad1139ff466b6d401b8e; From 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 · fixed in 1c8c6e912f2945b2a3e669afca6b52174b88e86e; From 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 · fixed in 6c92f6d9600efa3ef0d9e560a2b52776d9803c29

  • Linux Linux

    5.13

  • KernelLinux

    From 5.13.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.142; From 6.7.0 · fixed in 6.12.92; From 6.13.0 · fixed in 6.18.34; From 6.19.0 · fixed in 7.0.11

References 7

git.kernel.org