Global USE flag

Enable setuid root program, with potential security risks

Packages describing “suid” as local USE flag

Package “suid” Flag Description
net-wireless/kismet Install a setuid root helper binary with limited functionality; this allows running kismet as a normal user, significantly reducing security risks
sys-apps/util-linux install mount/umount as setuid so non-root users may mount/umount devices, and wall/write as setgid so non-root users can notify other users
sys-libs/glibc Make internal pt_chown helper setuid -- not needed if using Linux and have /dev/pts mounted with gid=5
www-client/chromium Build the SUID sandbox, which is only needed on CONFIG_USER_NS=n kernels