All RHEL 9 interactive users must have a primary group that exists.

If a user is assigned the Group Identifier (GID) of a group that does not exist on the system, and a group with the GID is subsequently created, the user may have unintended rights to any files associated with the group.

Verify that all RHEL 9 interactive users have a valid GID.

Check that the interactive users have a valid GID with the following command:

$ sudo pwck -r

If pwck reports "no group" for any interactive user, this is a finding.

Configure the system so that all GIDs are referenced in "/etc/passwd" are defined in "/etc/group".

Edit the file "/etc/passwd" and ensure that every user's GID is a valid GID.