XNU in the kernel in Apple iOS before 9 does not properly initialize an unspecified data structure, which allows local users to obtain sensitive memory-layout information via unknown vectors.
lists.apple.com/archives/security-announce/2015/Sep/msg00001.html
lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
www.securityfocus.com/bid/76764
www.securitytracker.com/id/1033609
support.apple.com/HT205212
support.apple.com/HT205213
support.apple.com/HT205267