CVE-2026-53374
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, the amdgpu driver has a vulnerability where the GART table is not zero-initialized upon allocation. After writing a single PTE entry, the TLB may speculatively load uninitialized, potentially valid-looking data from the same cache line, which can lead to the GPU using stale PTE entries.
Risk Assessment
The risk is that the GPU may use invalid, uninitialized GART table entries, potentially causing unpredictable system behavior, data leakage, or crashes.
Recommendation
Immediately update the Linux kernel to a version containing commit d9af8263b82b (or later), which ensures the GART table is zero-initialized after allocation using memset_io().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: zero-initialize GART table on allocation GART TLB is flushed after unmapping but not after mapping. Since amdgpu_bo_create_kernel() does not zero-initialize the buffer, when a single PTE is written the TLB may speculatively load other uninitialized entries from the same cacheline. Those garbage entries can appear valid, and a subsequent write to another PTE in the same cacheline may cause the GPU to use a stale garbage PTE from the TLB. Fix this by calling memset_io() to zero-initialize the GART table with gart_pte_flags immediately after allocation. Using AMDGPU_GEM_CREATE_VRAM_CLEARED, SDMA-based clear will not work since SDMA needs GART to be initialized to work. (cherry picked from commit d9af8263b82b6eaa60c5718e0c6631c5037e4b24)