CVE-2026-74447

Summary

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)

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxee0dc6c66a913260311876a4b2b53fe0b9bc3f94 < 273548eb997c6be85230c1236b18784b09f6203caffected
LinuxLinuxacfc84cfa70aca5b970faf152979bc97b9f8b0c0 < 6dc0b4b39ed4f11ef70f76ecea8537e35f45342baffected
LinuxLinux42ea9cf2f16b7131cb7302acb3dac510968f8bdc < 7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961affected
LinuxLinux42ea9cf2f16b7131cb7302acb3dac510968f8bdc < 83463a96ea3c7d8ae636a4d6a0ba63c9ce410724affected
LinuxLinuxc6ce687077cc67e4f3cbd0c89cb356fbbce91f4caffected
LinuxLinux6.12.75 < 6.12.103affected
LinuxLinux6.18.16 < 6.18.44affected
LinuxLinux6.19.6 < 6.20affected
LinuxLinux7.0affected
LinuxLinux0 < 7.0unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2-rc6 <= *unaffected

Weaknesses

References