CVE-2026-74444 drm/vmwgfx: validate DRAW_PRIMITIVES header size before division
A local attacker can trigger an integer overflow in the vmwgfx driver to read kernel memory out of bounds.
- 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-2026-74444?
CVE-2026-74444 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: validate DRAW_PRIMITIVES header size before division
vmw_cmd_draw() computes
maxnum = (header->size - sizeof(cmd->body)) / sizeof(*decl);
where header->size is u32 and is taken straight from the user-supplied command stream. When header->size is less than sizeof(cmd->body) the unsigned subtraction wraps to nearly 4 GiB, producing a huge maxnum. Any user-controlled cmd->body.numVertexDecls then passes the bound and the loop dereferences decl[i] far past the end of the kernel command bounce buffer, producing an out-of-bounds read of kernel memory.
Reject undersized headers up front.
Which versions are affected by CVE-2026-74444?
How do I fix CVE-2026-74444?
Apply the vendor's patch.
Is CVE-2026-74444 being exploited?
There is no known exploitation of CVE-2026-74444 in the wild and no public exploit code.
Sources
Also known as AZL-96234, BELL-CVE-2026-74444, DEBIAN-CVE-2026-74444, GHSA-m498-64hg-9w93, UBUNTU-CVE-2026-74444.