The netfilter/iptables module in Linux before 2.6.8.1 allows remote attackers to cause a denial of service (kernel crash) or bypass firewall rules via crafted packets, which are not properly handled by the skb_checksum_help function.
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=152532
http://secunia.com/advisories/19369
http://secunia.com/advisories/19374
http://secunia.com/advisories/19607
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10753
http://www.debian.org/security/2006/dsa-1017
http://www.debian.org/security/2006/dsa-1018
http://www.mandriva.com/security/advisories?name=MDKSA-2005:218
http://www.novell.com/linux/security/advisories/2005_18_kernel.html
http://www.redhat.com/support/errata/RHSA-2005-283.html
http://www.redhat.com/support/errata/RHSA-2005-284.html