All AlmaLinux OS 9 local files and directories must have a valid group owner.

Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as the GID of the files without a valid group owner.

Verify all local files and directories on AlmaLinux OS 9 have a valid group with the following command:

$ df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -nogroup

If any files on the system do not have an assigned group, this is a finding.

Either remove all files and directories from AlmaLinux OS 9 that do not have a valid group, or assign a valid group to all files and directories on the system with the "chgrp" command:

$ chgrp <group> <file>