CVE-2025-40226 firmware: arm_scmi: Account for failed debug initialization
A null pointer dereference in the Linux kernel SCMI debug subsystem can cause a system crash when debug initialization fails.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40226?
CVE-2025-40226 is a vulnerability in Linux, published on 4 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:
firmware: arm_scmi: Account for failed debug initialization
When the SCMI debug subsystem fails to initialize, the related debug root will be missing, and the underlying descriptor will be NULL.
Handle this fault condition in the SCMI debug helpers that maintain metrics counters.
Which versions are affected by CVE-2025-40226?
How do I fix CVE-2025-40226?
Apply the vendor's patch.
Is CVE-2025-40226 being exploited?
There is no known exploitation of CVE-2025-40226 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40226, DEBIAN-CVE-2025-40226, GHSA-p4j7-239h-h98g, ROOT-OS-UBUNTU-2404-CVE-2025-40226, UBUNTU-CVE-2025-40226.