Integer overflow in WebKit, as used on the Research In Motion (RIM) BlackBerry Torch 9800 with firmware 6.0.0.246, in Google Chrome before 10.0.648.133, and in Apple Safari before 5.0.5, allows remote attackers to execute arbitrary code via unknown vectors related to CSS "style handling," nodesets, and a length value, as demonstrated by Vincenzo Iozzo, Willem Pinckaers, and Ralf-Philipp Weinmann during a Pwn2Own competition at CanSecWest 2011.
http://dvlabs.tippingpoint.com/blog/2011/02/02/pwn2own-2011
http://googlechromereleases.blogspot.com/2011/03/stable-and-beta-channel-updates.html
http://lists.apple.com/archives/security-announce/2011//Apr/msg00000.html
http://lists.apple.com/archives/security-announce/2011//Apr/msg00001.html
http://lists.apple.com/archives/security-announce/2011//Apr/msg00002.html
http://secunia.com/advisories/43735
http://secunia.com/advisories/43748
http://secunia.com/advisories/43782
http://secunia.com/advisories/44151
http://secunia.com/advisories/44154
http://support.apple.com/kb/HT4596
http://support.apple.com/kb/HT4607
http://www.blackberry.com/btsc/KB26132
http://www.debian.org/security/2011/dsa-2192
http://www.securityfocus.com/archive/1/517513/100/0/threaded
http://www.securityfocus.com/bid/46849
http://www.securitytracker.com/id?1025212
http://www.vupen.com/english/advisories/2011/0645
http://www.vupen.com/english/advisories/2011/0654
http://www.vupen.com/english/advisories/2011/0671
http://www.vupen.com/english/advisories/2011/0984
http://www.zdnet.com/blog/security/pwn2own-2011-blackberry-falls-to-webkit-browser-attack/8401