CVE-2026-68276 drm/amdgpu/gfx: fix cleaner shader IB buffer overflow
A buffer overflow in the amdgpu cleaner shader allows local attackers to cause kernel crashes or potentially escalate privileges.
- 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-2026-68276?
CVE-2026-68276 is a memory corruption vulnerability in Linux, published on 10 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/amdgpu/gfx: fix cleaner shader IB buffer overflow
The cleaner shader sysfs path allocates a 16-dword (64 byte) IB but incorrectly fills (align_mask + 1) dwords. On GFX rings align_mask is 0xff, so the loop wrote 256 dwords into a 64-byte buffer, causing a kernel page fault.
The IB only needs to be a minimal NOP shell to schedule the job; the cleaner shader itself is emitted on the ring via emit_cleaner_shader(). Fill 16 dwords to match the allocation.
v2: Use ib_size_dw variable (Lijo)
(cherry picked from commit bf21af331ebf72d0935fd70c73192414a422c03a)
Which versions are affected by CVE-2026-68276?
How do I fix CVE-2026-68276?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68276 being exploited?
There is no known exploitation of CVE-2026-68276 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68276, DEBIAN-CVE-2026-68276, GHSA-2f7w-jqwh-gfwp, UBUNTU-CVE-2026-68276.