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The Guardian has an article on it here https://www.theguardian.com/technology/2017/oct/16/wpa2-wifi-security-vulnerable-hacking-us-government-warns. [theguardian.com]
Heres the researchers description...
We discovered serious weaknesses in WPA2, a protocol that secures all modern protected Wi-Fi networks. An attacker within range of a victim can exploit these weaknesses using key reinstallation attacks (KRACKs). Concretely, attackers can use this novel attack technique to read information that was previously assumed to be safely encrypted. This can be abused to steal sensitive information such as credit card numbers, passwords, chat messages, emails, photos, and so on. The attack works against all modern protected Wi-Fi networks. Depending on the network configuration, it is also possible to inject and manipulate data. For example, an attacker might be able to inject ransomware or other malware into websites.
From https://www.krackattacks.com [krackattacks.com]