CVE-2026-46220 drm/amdgpu/sdma4: replace BUG_ON with WARN_ON in fence emission
Unprivileged users can trigger a kernel panic via crafted GPU submissions, causing a 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-2026-46220?
CVE-2026-46220 is a medium-severity denial of service vulnerability in Linux kernel, published on 28 May 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/sdma4: replace BUG_ON with WARN_ON in fence emission
sdma_v4_0_ring_emit_fence() contains two BUG_ON(addr & 0x3) assertions that verify fence writeback addresses are dword-aligned. These assertions can be reached from unprivileged userspace via crafted DRM_IOCTL_AMDGPU_CS submissions, causing a fatal kernel panic in a scheduler worker thread.
Replace both BUG_ON() calls with WARN_ON() to log the condition without crashing the kernel. A misaligned fence address at this point indicates a driver bug, but crashing the kernel is never the correct response when the assertion is reachable from userspace.
The CS IOCTL path is the correct place to filter invalid submissions; the ring emission callback is too late to do anything about it.
(cherry picked from commit b90250bd933afd1ba94d86d6b13821997b22b18e)
Weakness: CWE-617
Which versions are affected by CVE-2026-46220?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46220?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-46220 being exploited?
There is no known exploitation of CVE-2026-46220 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-89054, BELL-CVE-2026-46220, DEBIAN-CVE-2026-46220, GHSA-5vh3-fx9f-223v, ROOT-OS-DEBIAN-11-CVE-2026-46220, ROOT-OS-DEBIAN-12-CVE-2026-46220 and 3 more.