Linux Kernel AMDGPU VCN User Fence Vulnerability

A vulnerability in the Linux kernel's AMDGPU VCN 2.0 encoder and decoder rings has been addressed. These rings do not support 64-bit user fence writes, leading to a rejection of command submissions that include user fences. The vulnerability has been fixed by setting the 'no_user_fence' option for the VCN 2.0 rings, allowing them to properly handle command submissions without user fence interference.

Impact

The vulnerability could cause issues with command submission synchronization, potentially leading to incorrect processing of multimedia tasks that rely on the VCN hardware.