An attacker could now read all information passing over any wifi network secured by WPA2, which is most routers, both public and private.
All platforms are vulnerable, but the paper notes that Android 6.0 and later - along with Linux - is a particularly easy target, an attack against these devices being described as 'trivial' ...
We discovered serious weaknesses in WPA2, a protocol that secures all modern protected Wi-Fi networks. Attackers can use this novel attack technique to read information that was previously assumed to be safely encrypted.
Android, Linux, Apple, Windows, OpenBSD, MediaTek, Linksys, and others, are all affected by some variant of the attacks.
With Android and Linux, an attacker doesn't even have to do that much work: the attacker can simply reset the encryption key.
The good news is that Vanhoef says that WPA2 can be patched to block the attack, and the patch will be backward compatible. Once a patch is available for your router, you should update the firmware without delay.
