The Netlink implementation in the Linux kernel through 3.14.1 does not provide a mechanism for authorizing socket operations based on the opener of a socket, which allows local users to bypass intended access restrictions and modify network configurations by using a Netlink socket for the (1) stdout or (2) stderr of a setuid program.
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.14.9
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.45
http://www.openwall.com/lists/oss-security/2023/04/16/3
http://www.openwall.com/lists/oss-security/2014/04/23/6
http://rhn.redhat.com/errata/RHSA-2014-1959.html
http://marc.info/?l=linux-netdev&m=139828832919748&w=2
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00025.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00010.html