Sun Java SE 5.0 before Update 22 and 6 before Update 17, and OpenJDK, does not prevent the existence of children of a resurrected ClassLoader, which allows remote attackers to gain privileges via unspecified vectors, related to an "information leak vulnerability," aka Bug Id 6636650.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6906
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11484
https://bugzilla.redhat.com/show_bug.cgi?id=530173
http://www.mandriva.com/security/advisories?name=MDVSA-2010:084
http://security.gentoo.org/glsa/glsa-200911-02.xml
http://secunia.com/advisories/37386