It was reported  that when PHP is running with Zend Memory Management disabled, "fileinfo" extension might free() a region of memory twice.
Upstream commit that fixes this:
Fixed upstream in PHP 5.6.6 and 5.5.22:
Red Hat Product Security does not consider this bug to have any security impact on the php packages shipped in Red Hat Enterprise Linux. The double free is impossible to trigger because the value of map is NULL at the time efree() is called. When using Zend Memory Manager by default that would result immediately in a Out of memory (OOM) Error.