RHSA-2016:0780-1 Details:
https://rhn.redhat.com/errata/RHSA-2016-0780.html
Red Hat provides a script to titled 'Leap Second Issue Detector' to check if your system is subject to the leap second issue.
https://access.redhat.com/labsinfo/leapsecond
Please note you may require a value Red Hat login to access the above information. These details are not provided by CA.