The text-editing implementation in Google Chrome before 5.0.375.127, and webkitgtk before 1.2.6, does not check a node type before performing a cast, which has unspecified impact and attack vectors related to (1) DeleteSelectionCommand.cpp, (2) InsertLineBreakCommand.cpp, or (3) InsertParagraphSeparatorCommand.cpp in WebCore/editing/.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11577
https://bugzilla.redhat.com/show_bug.cgi?id=628035
http://www.vupen.com/english/advisories/2011/0552
http://www.vupen.com/english/advisories/2011/0216
http://www.vupen.com/english/advisories/2010/2722
http://www.ubuntu.com/usn/USN-1006-1
http://www.securityfocus.com/bid/44201
http://www.redhat.com/support/errata/RHSA-2011-0177.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:039
http://trac.webkit.org/changeset/63773
http://secunia.com/advisories/43086
http://secunia.com/advisories/41856
http://googlechromereleases.blogspot.com/2010/08/stable-channel-update_19.html