Apple has confirmed to me that #wpa2 #KRACK exploit has already been patched in iOS, tvOS, watchOS, macOS betas.
Discovered by security researcher Mathy Vanhoef, the method of using key reinstallation attacks (KRACKs) allow attackers to read information that was previously assumed to be safely encrypted and steal sensitive information such as credit card numbers, passwords, chat messages, emails, photos, and so on.
You can learn more about the KRACK exploit by clicking here.
Ritchie also noted that "Patches for KRACKED will be mainly client side. AirPorts should already be unaffected in the vast majority of cases."