CVE-2023-53827 Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}
A use-after-free vulnerability in the Linux kernel's Bluetooth L2CAP subsystem allows attackers to potentially execute code or cause a system crash.
- 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-2023-53827?
CVE-2023-53827 is a high-severity use after free vulnerability in Linux, published on 9 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 use-after-free in l2cap_disconnect_{req,rsp}
Similar to commit d0be8347c623 ("Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put"), just use l2cap_chan_hold_unless_zero to prevent referencing a channel that is about to be destroyed.
Which versions are affected by CVE-2023-53827?
How do I fix CVE-2023-53827?
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-2023-53827 being exploited?
There is no known exploitation of CVE-2023-53827 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-53827, DEBIAN-CVE-2023-53827, GHSA-gvg6-6cf6-h6vq, UBUNTU-CVE-2023-53827.