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.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=bcc2c9c3fff859e0eb019fe6fec26f9b8eba795c
lists.opensuse.org/opensuse-updates/2012-11/msg00042.html
openwall.com/lists/oss-security/2012/06/06/12
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.4.5
www.openwall.com/lists/oss-security/2012/11/27/12
bugzilla.novell.com/show_bug.cgi?id=761200
github.com/torvalds/linux/commit/bcc2c9c3fff859e0eb019fe6fec26f9b8eba795c