CVE-2022-50643 cifs: Fix xid leak in cifs_copy_file_range()
A resource leak in the Linux kernel CIFS module allows local attackers to exhaust kernel resources, potentially 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-2022-50643?
CVE-2022-50643 is a denial of service 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:
cifs: Fix xid leak in cifs_copy_file_range()
If the file is used by swap, before return -EOPNOTSUPP, should free the xid, otherwise, the xid will be leaked.
Which versions are affected by CVE-2022-50643?
How do I fix CVE-2022-50643?
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-2022-50643 being exploited?
There is no known exploitation of CVE-2022-50643 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50643, GHSA-q456-pf4h-pf4v, UBUNTU-CVE-2022-50643.