A Denial-of-Service flaw was found in MySQL. An authenticated database user could use this flaw to cause a temporary denial of service (mysqld crash)
This issue was assigned CVE-2012-5614.
Some other references:
This is noted in Oracle's April CPU as:
An unspecified vulnerability in the Server XML subcomponent of Oracle MySQL allows remote authenticated attackers to cause a denial of service.
This flaw affects MySQL 5.1.67 and earlier, and 5.5.29 and earlier.
This issue has been addressed in following products:
Red Hat Enterprise Linux 6
Via RHSA-2013:0772 https://rhn.redhat.com/errata/RHSA-2013-0772.html