Windows 11 24H2 Error 0x18B KB5055523  

Buggybyte

Blue Screen of Death and Secure Kernel Errors Confirmed by Microsoft

The latest Windows 11 24H2 update (KB5055523 ) is causing critical issues for some users, including the dreaded Blue Screen of Death (BSOD) with error code 0x18B. Know what's going wrong and how Microsoft is fixing it.

Windows 11 Update KB5055523  What You Need to Know

Microsoft rolled out the KB5055523  update for Windows 11 version 24H2 last week as part of its regular Patch Tuesday cycle. But not everything has gone smoothly. In fact, KB5055523  is turning into a bit of a nightmare for a number of users.

While the update was designed to address performance and security enhancements, it’s now becoming known for a much more infamous reason  it’s breaking Windows for some users, again.

Confirmed Issues Blue Screen of Death with Error Code 0x18B

Shortly after the update went live, Microsoft confirmed that some devices are crashing with a Blue Screen of Death (BSOD) after installing KB5055523  and restarting.

The specific error code users are encountering is

0x18B – SECURE_KERNEL_ERROR

This error points to a failure in Windows secure kernel environment, an essential component responsible for low level system security operations.

User Reports and Community Feedback

Though official acknowledgment took some time, many users had already been flagging the issue on

Windows Feedback Hub

Tech support forums

YouTube comment sections

So if you’ve been hit with this error post update, you’re not alone, and you're not imagining it either.

Microsoft’s Response  Known Issue Rollback (KIR)

Thankfully, Microsoft has responded by activating a Known Issue Rollback (KIR) a behind the scenes fix that reverses the problematic part of the update without needing user intervention.

What is KIR?

KIR is a Windows servicing improvement tool that allows Microsoft to roll back specific problematic fixes in a patch without requiring another update from the user. Here's how it works

KIR is applied automatically from Microsoft’s end

No downloads or actions required on your part

It may take up to 24 hours to fully apply

Applies to consumer and non managed business devices

If you’re affected and want to speed up the process, restart (don’t shut down) your device. This often triggers the rollback effect faster.

Is This the Only Bug in KB5055523 ?

Unfortunately, no. This isn't the first time this update has caused trouble. As Microsoft patches one issue, it seems two more surface shortly after.

Previous update issues have included system freezes, login failures, and slow boot times

Users should be cautious about rolling out KB5055523  on critical systems until the dust settles

We’ve linked our previous coverage of the initial KB5055523  problems and a walkthrough video down below. Don’t miss those if you want a full picture of what this update has done so far.

What You Should Do Now

If you haven’t installed the update yet, you might want to pause updates until more stability is confirmed.

If you already installed it and are running into BSOD errors

Restart your device (not shut down)

Wait up to 24 hours for the Known Issue Rollback to apply

Check Windows Update History for any secondary patches that may have been applied silently

If the issue persists after 24 hours, consider reaching out to Microsoft Support



While Microsoft’s commitment to regular security patches is commendable, quality control is clearly still a work in progress. The KB5055523  update for Windows 11 24H2 is yet another example of how rushed updates can introduce new issues faster than they fix old ones.