IOAcceleratorFamily in Apple OS X before 10.11.2 and tvOS before 9.1 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
http://lists.apple.com/archives/security-announce/2015/Dec/msg00001.html
http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html
http://www.securitytracker.com/id/1034344