CVE-2025-40277 drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE
A local attacker can trigger an integer overflow in the vmwgfx driver, leading to out-of-bounds memory access and potential code execution or system crash.
- 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-2025-40277?
CVE-2025-40277 is a high-severity vulnerability in Linux, published on 6 Dec 2025. 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 command header size against SVGA_CMD_MAX_DATASIZE
This data originates from userspace and is used in buffer offset calculations which could potentially overflow causing an out-of-bounds access.
Which versions are affected by CVE-2025-40277?
How do I fix CVE-2025-40277?
Apply the vendor's patch.
Is CVE-2025-40277 being exploited?
There is no known exploitation of CVE-2025-40277 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40277, DEBIAN-CVE-2025-40277, GHSA-6jjc-g279-fq4c, ROOT-OS-DEBIAN-12-CVE-2025-40277, ROOT-OS-DEBIAN-13-CVE-2025-40277, ROOT-OS-UBUNTU-2204-CVE-2025-40277 and 2 more.