Use-after-free vulnerability in the IOAccelContext2::clientMemoryForType 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 (memory corruption) via a crafted app, a different vulnerability than CVE-2016-1817 and CVE-2016-1818.
https://www.exploit-db.com/exploits/39928/
https://support.apple.com/HT206568
https://support.apple.com/HT206567
https://support.apple.com/HT206566
https://support.apple.com/HT206564
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-2914
https://bugs.chromium.org/p/project-zero/issues/detail?id=772
http://lists.apple.com/archives/security-announce/2016/May/msg00004.html
http://lists.apple.com/archives/security-announce/2016/May/msg00003.html
http://lists.apple.com/archives/security-announce/2016/May/msg00002.html
http://lists.apple.com/archives/security-announce/2016/May/msg00001.html