The netlink_sendmsg function in net/netlink/af_netlink.c in the Linux kernel before 3.5.5 does not validate the dst_pid field, which allows local users to have an unspecified impact by spoofing Netlink messages.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=20e1db19db5d6b9e4e83021595eab0dc8f107bef
marc.info/?l=linux-netdev&m=134522422125983&w=2
marc.info/?l=linux-netdev&m=134522422925986&w=2
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.5.5
www.openwall.com/lists/oss-security/2015/02/22/10
www.securityfocus.com/bid/72739
bugzilla.redhat.com/show_bug.cgi?id=848949
github.com/torvalds/linux/commit/20e1db19db5d6b9e4e83021595eab0dc8f107bef