PT-2026-64334 · Linux · Linux

CVE-2026-64219 · Published 2026-07-24 · Updated 2026-07-24

NVD

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)

Related Identifiers

CVE-2026-64219

Affected Products

Linux

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-64219 · Security Note
• https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e · Note
• https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29 · Note
• https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b · Note
• https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b · Note
• https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e · Note
• https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71 · Note
• https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d · Note