IOAcceleratorFamily in Apple iOS before 9.3.3 and watchOS before 2.2.2 allows local users to obtain sensitive information from kernel memory or cause a denial of service (out-of-bounds read) via unspecified vectors.
http://lists.apple.com/archives/security-announce/2016/Jul/msg00001.html
http://lists.apple.com/archives/security-announce/2016/Jul/msg00002.html
https://support.apple.com/HT206902