CVE-2025-12801

A vulnerability was recently discovered in the rpc.mountd daemon in the nfs-utils package for Linux, that allows a NFSv3 client to escalate the privileges assigned to it in the /etc/exports file at mount time. In particular, it allows the client to access any subdirectory or subtree of an exported directory, regardless of the set file permissions, and regardless of any 'root_squash' or 'all_squash' attributes that would normally be expected to apply to that client.

This MODERATE impact vulnerability in rpc.mountd within the nfs-utils package allows an authenticated NFSv3 client to bypass configured root_squash or all_squash restrictions. This enables the client to access subdirectories of an exported NFS share with elevated privileges, regardless of the intended file permissions. Red Hat Enterprise Linux systems configured as NFSv3 servers are affected.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.