CVE-2025-39912 nfs/localio: restore creds before releasing pageio data
A missing credential restoration in Linux kernel NFS local I/O can trigger a kernel bug, causing a denial of service.
- 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-2025-39912?
CVE-2025-39912 is a medium-severity vulnerability in Linux kernel, published on 1 Oct 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:
nfs/localio: restore creds before releasing pageio data
Otherwise if the nfsd filecache code releases the nfsd_file immediately, it can trigger the BUG_ON(cred == current->cred) in __put_cred() when it puts the nfsd_file->nf_file->f-cred.
Which versions are affected by CVE-2025-39912?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-39912?
Apply the vendor's patch.
Is CVE-2025-39912 being exploited?
There is no known exploitation of CVE-2025-39912 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-39912, DEBIAN-CVE-2025-39912, GHSA-9qxq-33m2-8r47, UBUNTU-CVE-2025-39912.