CVE-2026-53374

Summary

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)

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 40df11255d71b02e20e70579f1b12b687e396e26affected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 91fbb5e635c8fb1b49e15c19da06480089ef719faffected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 8ae8b9e74bab94aab1d79f1688129bcc61c8b29aaffected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < b17175d0a375b3ed5e81597dac4983fdb46e478daffected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < 791941be5da125d9a1b228582bfdc300c05d05b3affected
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21 < e6c2e6c2e1fa066968a16aca1cb66cd1bdde7741affected
LinuxLinux4.2affected
LinuxLinux0 < 4.2unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.90 <= 6.12.*unaffected
LinuxLinux6.18.32 <= 6.18.*unaffected
LinuxLinux7.0.9 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References