CVE-2026-74443 drm/vmwgfx: bound DMA command body size against suffix pointer
A race condition in the vmwgfx driver allows attackers to corrupt command stream fields, potentially leading to privilege escalation or code execution.
- 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-2026-74443?
CVE-2026-74443 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/vmwgfx: bound DMA command body size against suffix pointer
vmw_cmd_dma() locates the DMA suffix at
(unsigned long) &cmd->body + header->size - sizeof(*suffix)
without checking that header->size is large enough to contain both cmd->body and the suffix. An undersized header makes the suffix pointer underflow back into the previous command in the bounce buffer. The verifier later writes suffix->maximumOffset, clobbering verified fields of an already-relocated earlier command -- a TOCTOU on the device-visible command stream that lets one command rewrite another's GMR id, surface id, or other authenticated fields.
Reject the command if the body is too small for the suffix to fit.
Which versions are affected by CVE-2026-74443?
How do I fix CVE-2026-74443?
Apply the vendor's patch.
Is CVE-2026-74443 being exploited?
There is no known exploitation of CVE-2026-74443 in the wild and no public exploit code.
Sources
Also known as AZL-96336, BELL-CVE-2026-74443, DEBIAN-CVE-2026-74443, GHSA-hrvm-q452-gmcq, UBUNTU-CVE-2026-74443.