I'm still with 10.11. I don't plan to update soon, since the benefit of Siri, Photos and the other major features is quite small, compared to the risk that I might loose working days if something goes wrong ( I'm a freelancer ).
As far as I read in the article there will be 10.12.1 ( the final fix ) which will have that part of the kernel refactored. I hope Apple will also support 10.11 and issue an update with the same fix.
I got an update to 10.11 El Capitan yesterday, which probably fixes the vulnerability. You can see the fix in Apple's support page, have a look at the bottom of the page about "System Boot":
As far as I read in the article there will be 10.12.1 ( the final fix ) which will have that part of the kernel refactored. I hope Apple will also support 10.11 and issue an update with the same fix.