The IOAccelSharedUserClient2::page_off_resource method in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (NULL pointer dereference) via a crafted app.
lists.apple.com/archives/security-announce/2016/May/msg00001.html
lists.apple.com/archives/security-announce/2016/May/msg00002.html
lists.apple.com/archives/security-announce/2016/May/msg00003.html
lists.apple.com/archives/security-announce/2016/May/msg00004.html
packetstormsecurity.com/files/137400/OS-X-IOAccelSharedUserClient2-page_off_resource-NULL-Pointer-Dereference.html
www.securityfocus.com/bid/90694
www.securitytracker.com/id/1035890
bugs.chromium.org/p/project-zero/issues/detail?id=778
support.apple.com/HT206564
support.apple.com/HT206566
support.apple.com/HT206567
support.apple.com/HT206568
www.exploit-db.com/exploits/39924/