WebKit, as used in Apple iOS before 9.1, 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-2015-10-21-1.
https://support.apple.com/HT205370
http://www.securitytracker.com/id/1033929
http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.html