Race condition in the kernel in Apple iOS before 9.3 and OS X before 10.11.4 allows attackers to execute arbitrary code in a privileged context via a crafted app.
https://www.exploit-db.com/exploits/39741/
https://www.exploit-db.com/exploits/39595/
https://support.apple.com/HT206167
https://support.apple.com/HT206166
https://bugs.chromium.org/p/project-zero/issues/detail?id=676
http://www.securitytracker.com/id/1035353
http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html
http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html