CVE-2025-37808 crypto: null - Use spin lock instead of mutex
A race condition in the Linux kernel crypto null algorithm can cause a crash when freed in softirq context, requiring a patch to replace mutexes with spin locks.
- 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-2025-37808?
CVE-2025-37808 is a medium-severity vulnerability in Debian Debian Linux, published on 8 May 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:
crypto: null - Use spin lock instead of mutex
As the null algorithm may be freed in softirq context through af_alg, use spin locks instead of mutexes to protect the default null algorithm.
Which versions are affected by CVE-2025-37808?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-37808?
Apply the vendor's patch.
Is CVE-2025-37808 being exploited?
There is no known exploitation of CVE-2025-37808 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2025-37808, DEBIAN-CVE-2025-37808, GHSA-hf6g-cq6h-j3vg, ROOT-OS-DEBIAN-12-CVE-2025-37808, ROOT-OS-UBUNTU-2204-CVE-2025-37808, ROOT-OS-UBUNTU-2404-CVE-2025-37808 and 1 more.