net/dccp/ccid.h in the Linux kernel before 3.5.4 allows local users to gain privileges or cause a denial of service (NULL pointer dereference and system crash) by leveraging the CAP_NET_ADMIN capability for a certain (1) sender or (2) receiver getsockopt call.
https://bugzilla.redhat.com/show_bug.cgi?id=919164
http://www.openwall.com/lists/oss-security/2013/03/07/2
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.5.4