An anonymous account on social network X - who regularly posts accurate information about iOS updates - said: Apple is preparing to release the iOS 17.6.1 update.

Apple is about to release iOS 17.6.1
MacRumors has also independently confirmed that Apple is internally testing iOS 17.6.1, and the update is listed in the site's analytics logs.
iOS 17.6.1 is known to have a build number of 21G93. Although there is no notable information about this update, it is certainly just a minor update (especially when Apple is testing iOS 18 and iOS 18.1 beta). So it is very likely that iOS 17.6.1 will include bug fixes or security patches.
Now, iOS 17.6 introduces a brand new feature for sports fans in the TV app for MLS Season Pass subscribers: Catch Up, which lets you watch some of the best highlights of a match in progress so you can catch up even if you missed the beginning.
iOS 17.6 focuses on stability and performance improvements and is expected to be the last major update for iOS 17.