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Ever since people installed Microsoft's April cumulative update for Windows 11 24H2 (KB5055523), many have been greeted by a blue screen showing error code 0x18B and the message SECURE_KERNEL_ERROR. What started as a few scattered reports after March's KB5053656 and KB5053598 patches quickly became a widespread frustration once the April release went live. Some PCs reboot every minute or two, while others refuse to start up at all. Microsoft has acknowledged the problem in an updated support notice and is rolling out a Known Issue Rollback (KIR) to strip out the offending code. Home users should see the fix applied automatically within 24 hours, though you can speed things along by signing back in after a crash, opening Settings > Update & Security, and checking for updates up to five times. The rollback won't appear in your update history, but it will install quietly in the background.
IT teams don't need to wait, either. Administrators can push the KIR patch via Group Policy, and full instructions are available on Microsoft's support site. While the company hasn't detailed exactly what triggers the SECURE_KERNEL_ERROR or how often it occurs, a permanent correction is set to arrive in a future monthly update. In addition to the blue screens and reboot loops, some users have reported that Windows Hello facial recognition and fingerprint login stopped working. The quick workaround is removing and reconfiguring your biometric credentials. However, a complete repair is expected in May. After installing April's update, you may also notice a new "Inetpub" folder on your C: drive. This directory is the default home for Internet Information Services web files, and Microsoft confirms it was created on purpose to support optional web‑hosting features. If you haven't enabled IIS, the folder will sit unused and doesn't pose any risk, so avoid deleting it to prevent potential errors if you choose to turn those services on later. In the meantime, keep Windows Updates checked for any new patches.
View at TechPowerUp Main Site | Source
IT teams don't need to wait, either. Administrators can push the KIR patch via Group Policy, and full instructions are available on Microsoft's support site. While the company hasn't detailed exactly what triggers the SECURE_KERNEL_ERROR or how often it occurs, a permanent correction is set to arrive in a future monthly update. In addition to the blue screens and reboot loops, some users have reported that Windows Hello facial recognition and fingerprint login stopped working. The quick workaround is removing and reconfiguring your biometric credentials. However, a complete repair is expected in May. After installing April's update, you may also notice a new "Inetpub" folder on your C: drive. This directory is the default home for Internet Information Services web files, and Microsoft confirms it was created on purpose to support optional web‑hosting features. If you haven't enabled IIS, the folder will sit unused and doesn't pose any risk, so avoid deleting it to prevent potential errors if you choose to turn those services on later. In the meantime, keep Windows Updates checked for any new patches.

View at TechPowerUp Main Site | Source