WebKit, as used in Apple Safari before 9.0.1 and iTunes before 12.3.1, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site, a different vulnerability than other WebKit CVEs listed in APPLE-SA-2015-10-21-3 and APPLE-SA-2015-10-21-5.
https://support.apple.com/HT205377
https://support.apple.com/HT205372
http://www.securitytracker.com/id/1033939
http://www.securityfocus.com/bid/77264
http://lists.apple.com/archives/security-announce/2015/Oct/msg00006.html
http://lists.apple.com/archives/security-announce/2015/Oct/msg00004.html