crun: crun: Privilege escalation due to incorrect parsing of the `--user` option

A flaw was found in crun, an open-source OCI Container Runtime. A local user can exploit this vulnerability due to incorrect parsing of the --user option when using crun exec. The value 1 is misinterpreted as root privileges User ID 0 and Group ID 0 instead of the intended User ID 1 and Group ID ...