Use-after-free vulnerability in Hypervisor in Apple OS X before 10.11.2 allows local users to gain privileges via vectors involving VM objects.
https://www.exploit-db.com/exploits/39370/
https://support.apple.com/HT205637
http://www.securitytracker.com/id/1034344
http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html