CoreText in Apple iOS before 9.1, OS X before 10.11.1, and iTunes before 12.3.1 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted font file, a different vulnerability than CVE-2015-6975 and CVE-2015-6992.
https://support.apple.com/HT205375
https://support.apple.com/HT205372
https://support.apple.com/HT205370
http://www.securitytracker.com/id/1033929
http://lists.apple.com/archives/security-announce/2015/Oct/msg00006.html
http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html
http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.html