CVE-2023-53766 FS: JFS: Check for read-only mounted filesystem in txBegin
A local attacker can cause a denial of service via a NULL pointer dereference in the JFS filesystem when attempting to start a transaction on a read-only mounted filesystem.
- 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-2023-53766?
CVE-2023-53766 is a vulnerability in Linux, published on 8 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:
FS: JFS: Check for read-only mounted filesystem in txBegin
This patch adds a check for read-only mounted filesystem in txBegin before starting a transaction potentially saving from NULL pointer deref.
Which versions are affected by CVE-2023-53766?
How do I fix CVE-2023-53766?
Apply the vendor's patch.
Is CVE-2023-53766 being exploited?
There is no known exploitation of CVE-2023-53766 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-53766, DEBIAN-CVE-2023-53766, GHSA-2989-gqx8-wgwx, UBUNTU-CVE-2023-53766.