BSOD SECURE_KERNEL_ERROR after install

The March preview update for Windows 11 24H2 introduced a Blue Screen of Death with the delightfully specific error 0x18B SECURE_KERNEL_ERROR — the secure kernel, it turns out, was not feeling very secure. Systems would BSOD shortly after installation and reboot. Those lucky enough to avoid the blue screen still got installation failures stuck at various percentages before rolling back with “Something didn’t go as planned.” Microsoft deployed a Known Issue Rollback to automatically undo the damage, though enterprise admins needed to manually deploy a Group Policy to get even that automatic fix. The kernel error wasn’t fully resolved until KB5055627 arrived a month later.