CVE-2026-74447 drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment
A local attacker can trigger an integer overflow in the AMD KFD driver, causing GPU faults and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74447?
CVE-2026-74447 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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)
Which versions are affected by CVE-2026-74447?
How do I fix CVE-2026-74447?
Apply the vendor's patch.
Is CVE-2026-74447 being exploited?
There is no known exploitation of CVE-2026-74447 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74447, DEBIAN-CVE-2026-74447, GHSA-hxwh-98gw-89f6, UBUNTU-CVE-2026-74447.