syslog in Apple iOS before 9.2.1, OS X before 10.11.3, and tvOS before 9.1.1 allows local users to gain privileges or cause a denial of service (memory corruption) via unspecified vectors.
https://support.apple.com/HT206168
https://support.apple.com/HT205732
https://support.apple.com/HT205731
https://support.apple.com/HT205729
http://www.securitytracker.com/id/1034736
http://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html
http://lists.apple.com/archives/security-announce/2016/Jan/msg00005.html
http://lists.apple.com/archives/security-announce/2016/Jan/msg00003.html
http://lists.apple.com/archives/security-announce/2016/Jan/msg00002.html