Google has released January security patch couple of days back to its Nexus and Pixel line smartphone which includes protection against the two new security issues, Meltdown and Spectre flaws.
We're rolling out a software update (build NMJ88C) with the January security patches and fixes for the Spectre and Meltdown security flaws.
— Essential (@essential) January 5, 2018
Today Essential Phone as started to roll-out January security update which carries the fix for the Meltdown and Spectre flaws. The update carries the build number NMJ88C.
To check for the update head to settings-> About -> Software update.