acpid2 is a daemon for Advanced Configuration and Power Interface.
acpid2 does not properly use the pidof program in powerbtn.sh.
A local attacker could gain escalated privileges.
There is no known workaround at this time.
All acpid2 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-power/acpid-2.0.17"