net/ipv4/ip_gre.c in the Linux kernel before 2.6.34, when ip_gre is configured as a module, allows remote attackers to cause a denial of service (OOPS) by sending a packet during module loading.
https://github.com/torvalds/linux/commit/c2892f02712e9516d72841d5c019ed6916329794
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-1766
https://bugzilla.redhat.com/show_bug.cgi?id=702303
http://www.openwall.com/lists/oss-security/2011/05/05/6
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.34