The swiotlb functionality in the r8169 driver in drivers/net/r8169.c in the Linux kernel before 2.6.27.22 allows remote attackers to cause a denial of service (IOMMU space exhaustion and system crash) by using jumbo frames for a large amount of network traffic, as demonstrated by a flood ping.
https://rhn.redhat.com/errata/RHSA-2009-1548.html
https://rhn.redhat.com/errata/RHSA-2009-1540.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7377
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10209
http://www.vupen.com/english/advisories/2010/0528
http://www.ubuntu.com/usn/usn-864-1
http://www.redhat.com/support/errata/RHSA-2009-1671.html
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.22
http://secunia.com/advisories/38834
http://secunia.com/advisories/38794
http://secunia.com/advisories/37909
http://lists.vmware.com/pipermail/security-announce/2010/000082.html
http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00005.html