Earlier this week, AT&T released a software update to the Samsung Galaxy S 6 edge (G925A), a 239MB file made available only via WiFi, using “Firmware Over The Air (FOTA)”.
The public documentation doesn’t specify security issues fixed, only “perf enhancements” and new features.
More information:
http://www.att.com/esupport/softwareUpdateArticle.jsp?sid=KB426710