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Re:About speculative execution vulnerabilities in ARM-based ... by tischler on Thursday January 04, 2018 @08:40PM (#16075803)
I'm on 10.12.6 on a Mid 2011 MacBook Air 13": "No Updates Available"

Edit: I see, there is a confusing typo in om2's comment (it should be 10.12.6 not 10.12.7). I am wondering why this update does not show up in my list of installed updates. What a mess.

Re:About speculative execution vulnerabilities in ARM-based ... by thelibrarian on Thursday January 04, 2018 @09:59PM (#16076136)
It was released as Security Update 2017-002 and 2017-005 for Sierra 10.12.6 and El Capitan 10.11.6 respectively, not as point version updates.
Re:About speculative execution vulnerabilities in ARM-based ... by om2 on Thursday January 04, 2018 @09:34PM (#16076036)
No, 10.12.7 is the right version. It's "available for" 10.12.6, which means that is the version that will be offered the update. I am not sure why it's not showing up for you. Consider contacting Apple support.