Graphics Driver in Apple OS X before 10.9.4 does not properly restrict read operations during processing of an unspecified system call, which allows local users to obtain sensitive information from kernel memory and bypass the ASLR protection mechanism via a crafted call.
http://www.securitytracker.com/id/1030505
http://support.apple.com/kb/HT6296
http://secunia.com/advisories/59475
http://archives.neohapsis.com/archives/bugtraq/2014-06/0172.html