CVE-2025-68243 NFS: Check the TLS certificate fields in nfs_match_client()
Attackers can bypass NFS TLS client identity verification by exploiting missing certificate field checks in the Linux kernel.
- 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-2025-68243?
CVE-2025-68243 is a high-severity vulnerability in Linux, published on 16 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:
NFS: Check the TLS certificate fields in nfs_match_client()
If the TLS security policy is of type RPC_XPRTSEC_TLS_X509, then the cert_serial and privkey_serial fields need to match as well since they define the client's identity, as presented to the server.
Which versions are affected by CVE-2025-68243?
How do I fix CVE-2025-68243?
Apply the vendor's patch.
Is CVE-2025-68243 being exploited?
There is no known exploitation of CVE-2025-68243 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68243, DEBIAN-CVE-2025-68243, GHSA-3m9h-22j9-8m85, UBUNTU-CVE-2025-68243.