CVE-2023-54214 Bluetooth: L2CAP: Fix potential user-after-free
A use-after-free vulnerability in the Linux kernel Bluetooth L2CAP subsystem allows attackers to potentially execute code or cause a denial of service.
- 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-2023-54214?
CVE-2023-54214 is a high-severity use after free vulnerability in Linux, published on 30 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:
Bluetooth: L2CAP: Fix potential user-after-free
This fixes all instances of which requires to allocate a buffer calling alloc_skb which may release the chan lock and reacquire later which makes it possible that the chan is disconnected in the meantime.
Which versions are affected by CVE-2023-54214?
How do I fix CVE-2023-54214?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-54214 being exploited?
There is no known exploitation of CVE-2023-54214 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54214, DEBIAN-CVE-2023-54214, GHSA-c5c6-fj3h-jwh2, UBUNTU-CVE-2023-54214.