The Disk Images component in Apple OS X before 10.11.2 and tvOS before 9.1 allows local users to gain privileges or cause a denial of service (memory corruption) via a crafted disk image.
https://www.exploit-db.com/exploits/39365/
https://support.apple.com/HT205640
https://support.apple.com/HT205637
http://www.securitytracker.com/id/1034344
http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html
http://lists.apple.com/archives/security-announce/2015/Dec/msg00001.html