Unspecified vulnerability in Oracle MySQL Server 5.6.26 and earlier allows remote authenticated users to affect availability via unknown vectors related to Server : Security : Privileges.
http://www.securitytracker.com/id/1033894
http://www.securityfocus.com/bid/77213
http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html