Researcher Mathy Vanhoef, from Belgian university KU Leuven, released information on his hack, dubbing it KRACK, for Key Reinstallation Attack. It affects a core encryption protocol, Wi-Fi Protected Access 2 (WPA2), relied on by most Wi-Fi users to keep their web use hidden and secret from others. More specifically, the KRACK attack sees a hacker trick a victim into reinstalling an already-in-use key. Given the range of devices affected, it's almost guaranteed patches won't make it to everyone. They've released the research paper in full on their dedicated KRACK attack website.
Source: Forbes October 16, 2017 10:52 UTC