Alex has an analysis of CPU July 2006 and also advisories
"DB21 - SYS.DBMS_STATS"
"DB22 - SYS.DBMS_UPGRADE"
"DB01 - SYS.DBMS_CDC_IMPDP"
"DB03 - SYS.KUPW$WORKER"
"DB06 - DBMS_EXPORT_EXTENSION"
Alex has also indicated that DB05, DB07 and DB16 are his as well but no advisories are there yet.
Also some of the bugs shown here detail the functions or procedures that are at fault.