Enterprise Wi-Fi killed at universities

December’s update killed Wi-Fi on enterprise and education networks using 802.1x authentication (WPA2-Enterprise/WPA3-Enterprise). Universities were hit hardest — entire campus wireless networks became unusable for students and staff overnight. Home networks using WPA2-Personal were fine, so Microsoft initially didn’t understand the scope. The bug was in Qualcomm 802.11r Wi-Fi module handling and EAP authentication paths. Microsoft deployed a Known Issue Rollback eight days later. Happy finals week, everyone.