CVE-2026-64219
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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)
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-674
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2bPatch
- https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86ePatch
- https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8ePatch
- https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53dPatch
- https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29Patch
- https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71Patch
- https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.