CVE-2026-74447
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, the amdkfd driver has a uint32_t overflow vulnerability in EOP ring buffer size alignment. A user-supplied size of 0xFFFFF001 wraps to 0, bypassing the size check and allowing acceptance of any BO. This can lead to out-of-bounds writes and GPU faults.
Risk Assessment
A local attacker could cause GPU faults or potentially gain unauthorized memory access, possibly leading to privilege escalation.
Recommendation
Apply the Linux kernel update containing the fix (commit ae443117b742c357bfef3a7bddabf76fcf86e9ef).
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment eop_ring_buffer_size in struct queue_properties is a u32. In kfd_queue_acquire_buffers() the expected EOP buffer size is computed as ALIGN(eop_ring_buffer_size, PAGE_SIZE); ALIGN uses typeof(x), so the addition is done in 32-bit. A user-supplied size of 0xFFFFF001 wraps to 0, causing kfd_queue_buffer_get() to skip its exact-size check (gated on size != 0) and accept any BO mapped at the address. On GFX8/GFX9 the MQD cp_hqd_eop_control is then programmed for an 8KB EOP ring backed by a 4KB BO, so CP EOP writes can land past the buffer and fault the GPU. Cast the operand to u64 so the alignment is computed in 64-bit; the size check in kfd_queue_buffer_get() then rejects the oversized request. (cherry picked from commit ae443117b742c357bfef3a7bddabf76fcf86e9ef)