CVE-2025-39714 media: usbtv: Lock resolution while streaming
A race condition in the usbtv driver causes a kernel crash when changing TV standards during streaming, 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-2025-39714?
CVE-2025-39714 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 5 Sep 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: usbtv: Lock resolution while streaming
When an program is streaming (ffplay) and another program (qv4l2) changes the TV standard from NTSC to PAL, the kernel crashes due to trying to copy to unmapped memory.
Changing from NTSC to PAL increases the resolution in the usbtv struct, but the video plane buffer isn't adjusted, so it overflows.
[hverkuil: call vb2_is_busy instead of vb2_is_streaming]
Which versions are affected by CVE-2025-39714?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-39714?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-39714 being exploited?
There is no known exploitation of CVE-2025-39714 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-67025, BELL-CVE-2025-39714, DEBIAN-CVE-2025-39714, GHSA-45h6-97cw-2x6c, ROOT-OS-DEBIAN-11-CVE-2025-39714, ROOT-OS-DEBIAN-12-CVE-2025-39714 and 4 more.