Question about Android Monthly Patch ( changing my phone )

Hey guys, Im a proud owner of a Galaxy S2 whose buttons, unfortunetly, are starting to fail . Im looking for the Galaxy S7, however what keeps me afraid of continuing on Android is that after Samsung promisses for monthly update I dont see them being applied on the Galaxy S6 and Note 5 I from my colleagues in Brazil . Im afraid someone discovers a stagefright vulnerability type and my S7 takes too much time to receive a patch. Any comments?

P.S: Sorry for my poor english

from xda-developers http://ift.tt/21F6q6z
via IFTTT