The main function in tools/hv/hv_kvp_daemon.c in hypervkvpd, as distributed in the Linux kernel before 3.4.5, does not validate the origin of Netlink messages, which allows local users to spoof Netlink communication via a crafted connector message.
https://github.com/torvalds/linux/commit/bcc2c9c3fff859e0eb019fe6fec26f9b8eba795c
https://bugzilla.novell.com/show_bug.cgi?id=761200
http://www.openwall.com/lists/oss-security/2012/11/27/12
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.4.5
http://openwall.com/lists/oss-security/2012/06/06/12
http://lists.opensuse.org/opensuse-updates/2012-11/msg00042.html