A few days ahead the official iPhone X launch date, Apple releases iOS 11.1, watchOS 4.1, tvOS 11.1 and macOS High Sierra 10.13.1.
These updates includes fix for Key Reinstallation Attacks – KRACK vulnerability.
As we have reported on October 23, 2017 iOS 11.1 build 15B93 was indeed the Golden Master. In addition to that, iOS 11.1 for iPhone X carries a different build number.