An issue was discovered in certain Apple products. iOS before 10.2 is affected. macOS before 10.12.2 is affected. watchOS before 3.1.3 is affected. The issue involves the "syslog" component. It allows local users to gain privileges via unspecified vectors related to Mach port name references.
https://www.exploit-db.com/exploits/40959/
https://support.apple.com/HT207487
https://support.apple.com/HT207423
https://support.apple.com/HT207422