Unspecified vulnerability in Oracle MySQL 5.5.31 and earlier and 5.6.11 and earlier allows remote authenticated users to affect availability via unknown vectors related to Optimizer.
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html