IBM DB2 UDB 9.1 before Fixpak 4 does not properly handle use of large numbers of file descriptors, which might allow attackers to have an unknown impact involving "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.securityfocus.com/bid/26450