The IOKit implementation in the kernel in Apple iOS before 7.1.2 and Apple TV before 6.1.2, and in IOReporting in Apple OS X before 10.9.4, allows local users to cause a denial of service (NULL pointer dereference and reboot) via crafted API arguments.
http://www.securitytracker.com/id/1030500
http://support.apple.com/kb/HT6296
http://secunia.com/advisories/59475
http://archives.neohapsis.com/archives/bugtraq/2014-06/0175.html
http://archives.neohapsis.com/archives/bugtraq/2014-06/0174.html
http://archives.neohapsis.com/archives/bugtraq/2014-06/0172.html