CVE-2025-68791 fuse: missing copy_finish in fuse-over-io-uring argument copies
A missing copy_finish in fuse-over-io-uring causes a reference count leak, potentially leading to 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-2025-68791?
CVE-2025-68791 is a denial of service vulnerability in Linux, published on 13 Jan 2026. 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:
fuse: missing copy_finish in fuse-over-io-uring argument copies
Fix a possible reference count leak of payload pages during fuse argument copies.
[Joanne: simplified error cleanup]
Which versions are affected by CVE-2025-68791?
How do I fix CVE-2025-68791?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-68791 being exploited?
There is no known exploitation of CVE-2025-68791 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68791, DEBIAN-CVE-2025-68791, GHSA-7jvc-cm4g-4hr3, UBUNTU-CVE-2025-68791.