The TCP/IP fragment reassembly handling in the Linux kernel 2.4 allows remote attackers to cause a denial of service (CPU consumption) via certain packets that cause a large number of hash table collisions.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A295
http://www.turbolinux.com/security/TLSA-2003-41.txt
http://www.redhat.com/support/errata/RHSA-2003-198.html
http://www.redhat.com/support/errata/RHSA-2003-195.html
http://www.redhat.com/support/errata/RHSA-2003-187.html
http://www.debian.org/security/2004/dsa-442
http://www.debian.org/security/2003/dsa-336
http://www.debian.org/security/2003/dsa-332