The ec_dev_ioctl function in net/econet/af_econet.c in the Linux kernel before 2.6.36.2 does not require the CAP_NET_ADMIN capability, which allows local users to bypass intended access restrictions and configure econet addresses via an SIOCSIFADDR ioctl call.
https://bugzilla.redhat.com/show_bug.cgi?id=644156
http://www.vupen.com/english/advisories/2011/0375
http://www.vupen.com/english/advisories/2011/0298
http://www.vupen.com/english/advisories/2011/0213
http://www.ubuntu.com/usn/USN-1023-1
http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
http://www.mandriva.com/security/advisories?name=MDVSA-2010:257
http://www.debian.org/security/2010/dsa-2126
http://secunia.com/advisories/43291
http://secunia.com/advisories/43056
http://openwall.com/lists/oss-security/2010/11/30/1
http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00007.html