Memory leak in drivers/net/xen-netback/netback.c in the Xen netback functionality in the Linux kernel before 3.7.8 allows guest OS users to cause a denial of service (memory consumption) by triggering certain error conditions.
https://github.com/torvalds/linux/commit/7d5145d8eb2b9791533ffe4dc003b129b9696c48
https://bugzilla.redhat.com/show_bug.cgi?id=910883
http://www.openwall.com/lists/oss-security/2013/02/05/12
http://www.mandriva.com/security/advisories?name=MDVSA-2013:176