man-db before 2.8.5 on Gentoo allows local users (with access to the man user account) to gain root privileges because /usr/bin/mandb is ex…

man-db before 2.8.5 on Gentoo allows local users (with access to the man user account) to gain root privileges because /usr/bin/mandb is executed by root but not owned by root. (Also, the owner can strip the setuid and setgid bits.)