CVE-2025-40207 media: v4l2-subdev: Fix alloc failure check in v4l2_subdev_call_state_try()
A missing error check in the Linux kernel V4L2 subsystem can cause a crash upon allocation failure, leading to 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-2025-40207?
CVE-2025-40207 is a vulnerability in Linux, published on 12 Nov 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:
media: v4l2-subdev: Fix alloc failure check in v4l2_subdev_call_state_try()
v4l2_subdev_call_state_try() macro allocates a subdev state with __v4l2_subdev_state_alloc(), but does not check the returned value. If __v4l2_subdev_state_alloc fails, it returns an ERR_PTR, and that would cause v4l2_subdev_call_state_try() to crash.
Add proper error handling to v4l2_subdev_call_state_try().
Which versions are affected by CVE-2025-40207?
How do I fix CVE-2025-40207?
Apply the vendor's patch.
Is CVE-2025-40207 being exploited?
There is no known exploitation of CVE-2025-40207 in the wild and no public exploit code.
Sources
Also known as AZL-70070, BELL-CVE-2025-40207, DEBIAN-CVE-2025-40207, GHSA-2m92-rj5f-pp8g, ROOT-OS-DEBIAN-13-CVE-2025-40207, ROOT-OS-UBUNTU-2404-CVE-2025-40207 and 1 more.