CVE-2023-54128 fs: drop peer group ids under namespace lock
A race condition in the Linux kernel allows concurrent mount modifications, potentially leading to privilege escalation.
- 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-2023-54128?
CVE-2023-54128 is a high-severity vulnerability in Linux, published on 24 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: drop peer group ids under namespace lock
When cleaning up peer group ids in the failure path we need to make sure to hold on to the namespace lock. Otherwise another thread might just turn the mount from a shared into a non-shared mount concurrently.
Which versions are affected by CVE-2023-54128?
How do I fix CVE-2023-54128?
Apply the vendor's patch.
Is CVE-2023-54128 being exploited?
There is no known exploitation of CVE-2023-54128 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54128, DEBIAN-CVE-2023-54128, GHSA-756h-2p6r-crqr, UBUNTU-CVE-2023-54128.