IBM DB2 UDB 9.1 before Fixpak 4 does not properly manage storage of a list containing authentication information, which might allow attackers to cause a denial of service (instance crash) or trigger memory corruption. NOTE: the vendor description of this issue is too vague to be certain that it is security-related.
http://www.vupen.com/english/advisories/2007/3867
http://www.vupen.com/english/advisories/2007/3538
http://www.securityfocus.com/bid/26450
http://www.ibm.com/support/docview.wss?uid=swg1LI72519
http://www-1.ibm.com/support/docview.wss?uid=swg21255607
http://www-1.ibm.com/support/docview.wss?rs=71&uid=swg21283031