The sfc (aka Solarflare Solarstorm) driver in the Linux kernel before 3.2.30 allows remote attackers to cause a denial of service (DMA descriptor consumption and network-controller outage) via crafted TCP packets that trigger a small MSS value.
http://rhn.redhat.com/errata/RHSA-2012-1323.html
http://rhn.redhat.com/errata/RHSA-2012-1324.html
http://rhn.redhat.com/errata/RHSA-2012-1347.html
http://rhn.redhat.com/errata/RHSA-2012-1375.html
http://rhn.redhat.com/errata/RHSA-2012-1401.html
http://rhn.redhat.com/errata/RHSA-2012-1430.html
https://bugzilla.redhat.com/show_bug.cgi?id=844714
https://github.com/torvalds/linux/commit/68cb695ccecf949d48949e72f8ce591fdaaa325c
https://www.suse.com/support/update/announcement/2012/suse-su-20121679-1.html
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.30
http://www.openwall.com/lists/oss-security/2012/08/03/4
http://www.ubuntu.com/usn/USN-1567-1
http://www.ubuntu.com/usn/USN-1568-1
http://www.ubuntu.com/usn/USN-1572-1
http://www.ubuntu.com/usn/USN-1575-1
http://www.ubuntu.com/usn/USN-1577-1
http://www.ubuntu.com/usn/USN-1578-1