The route cache implementation in Linux 2.4, and the Netfilter IP conntrack module, allows remote attackers to cause a denial of service (CPU consumption) via packets with forged source addresses that cause a large number of hash table collisions.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A261
https://exchange.xforce.ibmcloud.com/vulnerabilities/15382
http://www.securityfocus.com/bid/7601
http://www.secunia.com/advisories/8786/
http://www.redhat.com/support/errata/RHSA-2003-172.html
http://www.redhat.com/support/errata/RHSA-2003-147.html
http://www.redhat.com/support/errata/RHSA-2003-145.html
http://www.mandriva.com/security/advisories?name=MDKSA-2003:074
http://www.mandriva.com/security/advisories?name=MDKSA-2003:066
http://www.enyo.de/fw/security/notes/linux-dst-cache-dos.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
http://www.debian.org/security/2003/dsa-312
http://www.debian.org/security/2003/dsa-311
http://marc.info/?l=linux-kernel&m=104956079213417
http://marc.info/?l=bugtraq&m=105595901923063&w=2
http://marc.info/?l=bugtraq&m=105301461726555&w=2
http://archives.neohapsis.com/archives/vulnwatch/2003-q2/0073.html