CNN  —  The company that caused a massive computer outage across the world says a flawed update has been rolled back – but that doesn’t necessarily help the thousands of businesses that have been affected by the glitch. The CrowdStrike software issue at the heart of the outage runs at such a deep level in affected computers and systems that getting them up and running just to be will be, in many cases, an enormous challenge. That’s compounded by the fact that many of the servers that may contain information needed to get these systems working again are themselves caught in a cycle of crashing and rebooting. “I don’t think it’s too early to call it: this will be the largest IT outage in history,” said security expert Troy Hunt in a post on X. The CrowdStrike software at fault operates at what’s called the kernel level of a computer, a much deeper level than what more ordinary applications such as browsers or video games do. This portion of a device has much greater visibility and control over a computer and its components, making it critical for the operation of all other systems — and far more sensitive. Running at the kernel level means CrowdStrike’s software can do more to detect cyberattacks, but it also means the current bug is causing Windows computers to crash to a Blue Screen of Death before users can take any actions to correct it. The issue appears to be recoverable, CrowdStrike has said, but in many cases it requires painstaking work: Each affected device must be accessed by an administrator and manually rebooted into safe mode. Then, the offending CrowdStrike file must be deleted by hand. For businesses with hundreds or thousands of laptops, desktops and servers running CrowdStrike’s security software, an individual human may have to perform that process over and over and over again. “You can’t automate that,” said Kevin Beaumont, a security researcher and former Microsoft threat analyst, in a post on X. “So this is going to be incredibly painful for CrowdStrike customers.” It gets worse. Organizations that take security seriously will have likely encrypted their computers’ hard drives, making it even more challenging to access the file that needs to be deleted. This is a developing story. It will be updated.