The security_context_to_sid_core function in security/selinux/ss/services.c in the Linux kernel before 3.13.4 allows local users to cause a denial of service (system crash) by leveraging the CAP_MAC_ADMIN capability to set a zero-length security context. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-1874
