Race condition in the java.lang package in Sun Java SE 5.0 before Update 20 has unknown impact and attack vectors, related to a "3Y Race condition in reflection checks."
http://www.vupen.com/english/advisories/2009/3316
http://www.vmware.com/security/advisories/VMSA-2009-0016.html
http://www.securityfocus.com/archive/1/507985/100/0/threaded
http://sunsolve.sun.com/search/document.do?assetkey=1-21-118667-22-1
http://security.gentoo.org/glsa/glsa-200911-02.xml
http://secunia.com/advisories/37460