CVE-2025-68803

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the Linux kernel’s Network File System daemon (NFSD) related to handling Access Control Lists (ACLs) during NFSv4 file creation. Specifically, when an NFSv4 client attempts to set an ACL with a named principal during file creation, the ACL is not correctly applied to the inode. This occurs because the nfsd create setattr() function skips applying the POSIX ACL when only an ACL is present, violating RFC 8881 section 6.4.1.3. As a result, the server returns a default ACL based on the file’s mode bits instead of the originally specified ACL. The issue is located in the nfsd create setattr() function, which relies on nfsd attrs valid() to determine whether to call nfsd setattr().

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.