WebKit, as used in Apple Safari before 6.0, 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-2012-07-25-1.
Apple Security Advisory 2012-09-24-1 - Apple TV 5.1 is now available and addresses issues relating to malicious media loading, memory corruption, and more.