Race condition in ebtables netfilter module (ebtables.c) in Linux 2.6, when running on an SMP system that is operating under a heavy load, might allow remote attackers to cause a denial of service (crash) via a series of packets that cause a value to be modified after it has been read but before it has been locked.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11403
http://www.ubuntu.com/usn/usn-199-1
http://www.securityfocus.com/bid/15049
http://www.securityfocus.com/archive/1/427980/100/0/threaded
http://www.securityfocus.com/archive/1/419522/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2005-808.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:072
http://www.debian.org/security/2005/dsa-922
http://sourceforge.net/mailarchive/forum.php?thread_id=6800453&forum_id=8572
http://secunia.com/advisories/18056
http://secunia.com/advisories/17918