source: https://www.securityfocus.com/bid/8990/info

IBM DB2 has been reported to be prone to multiple buffer overflow vulnerabilities that present themselves in binaries that are shipped with DB2. The vulnerabilities are likely caused due to a lack of sufficient boundary checks performed on user supplied command-line arguments before they are copied into a reserved buffer in memory. It has been reported that by supplying arguments of excessive length to the respective vulnerable executables a local attacker may trigger the execution of arbitrary attacker-supplied instructions with elevated privileges. 

[kf@RiotStarter adm]$ source /home/db2inst1/sqllib/db2profile
[kf@RiotStarter adm]$ ./db2start `perl -e 'print "A" x 9901'`
Segmentation fault