Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
https://www.exploit-db.com/exploits/39010/
https://security.gentoo.org/glsa/201602-01
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-8436
http://packetstormsecurity.com/files/134948/Gentoo-QEMU-Local-Privilege-Escalation.html