The Linux kernel AMDGPU driver had a vulnerability where the Graphics Address Remapping Table (GART) Translation Lookaside Buffer (TLB) was flushed after unmapping but not after mapping. Because the buffer was not zero-initialized on creation, speculative execution could cause the TLB to load uninitialized entries from the same cacheline, which might appear valid. Subsequent writes could cause the GPU to use stale or garbage page table entries, potentially leading to incorrect GPU memory mappings. The vulnerability was fixed by calling memset_io() to zero-initialize the GART table with appropriate flags immediately after allocation.

This vulnerability could lead to the GPU using stale or garbage page table entries due to speculative loading of uninitialized GART entries. This may cause incorrect GPU memory mappings, potentially affecting GPU operation or stability. No known exploits in the wild have been reported. The impact is limited to systems using the AMDGPU driver in the Linux kernel.

A fix has been implemented in the Linux kernel by zero-initializing the GART table immediately after allocation. Users should apply the official Linux kernel updates that include this patch. Since this is a kernel-level fix, updating to a kernel version containing the patch is the recommended remediation. Patch status is confirmed resolved by the commit referenced in the description.