That changelog includes a bunch of fixes that are Sierra only, so the answer may be "no" contrary to your comment. This is the closest I can find on there to t

That changelog includes a bunch of fixes that are Sierra only, so the answer may be "no" contrary to your comment. This is the closest I can find on there to this issue and the fix is Sierra only: IOFireWireFamily Available for: macOS Sierra 10.12.1 Impact: A local attacker may be able to read kernel memory Description: A memory corruption issue was addressed through improved memory handling. CVE-2016-7608: Brandon Azad Attribution on that doesn;t look right; TFA was by "Ulf Frisk" who was nowhere on that page. Why would someone be using El Capitan still, some may ask. Well there is software not updated for Sierra yet. For example, GPG for Mac is not yet ported over.