The NVIDIA driver in the Graphics Drivers subsystem in Apple OS X before 10.11.4 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
https://www.exploit-db.com/exploits/39615/
https://support.apple.com/HT206167
http://www.securitytracker.com/id/1035363
http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html