Boot loops and BSODs on PCs with virtualization

June’s Patch Tuesday sent thousands of PCs into relentless boot loops. Systems with virtualization features enabled — which includes anyone running WSL, Hyper-V, Docker, or even just having memory integrity turned on — got caught in a BSOD cycle with stop code 0xC000021A. Machines that somehow survived the reboot gauntlet found their taskbar had disappeared or become completely unresponsive. Microsoft pulled the update sixteen days later and deployed a Known Issue Rollback, but the actual fix didn’t arrive until July’s Patch Tuesday. WebProNews called it “a routine patch, a digital nightmare.”