Linux Kernel: drm/amd stack buffer overflow in dc_process_dmub_aux_transfer_async
CVE-2026-64219 Published on July 24, 2026
drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
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)
Products Associated with CVE-2026-64219
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Affected Versions
Linux:- Version 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 and below d6590e3f766e3111dd1beaf88b9384d117acfa6b is affected.
- Version 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 and below 16a5fa57565afb6bf37e18129921c270c93d8e2b is affected.
- Version 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 and below 90c398e822ca76e40548df0c061dd4f93ea92d71 is affected.
- Version 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 and below 3265f3ed373fb8048be713aadcdf702579a0e53d is affected.
- Version 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 and below 1ecde19bfce6535bffddad1139ff466b6d401b8e is affected.
- Version 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 and below 1c8c6e912f2945b2a3e669afca6b52174b88e86e is affected.
- Version 4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6 and below 6c92f6d9600efa3ef0d9e560a2b52776d9803c29 is affected.
- Version 5.13 is affected.
- Before 5.13 is unaffected.
- Version 5.15.209, <= 5.15.* is unaffected.
- Version 6.1.175, <= 6.1.* is unaffected.
- Version 6.6.142, <= 6.6.* is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.