Two recent patches for Windows 11 24H2, specifically the April cumulative update KB5055523 and March preview update KB5053656, have caused blue screen crashes. Users experience a freeze and encounter error code 0x18B indicating a SECURE_KERNEL_ERROR following installation. Microsoft has not provided detailed explanations but is implementing a Known Issue Rollback (KIR) to address it. Personal users should receive the rollback update automatically, while IT departments must manually install a Group Policy file to mitigate the issue. A reboot is necessary to apply the fix.
You might encounter a blue screen exception with error code 0x18B indicating a SECURE_KERNEL_ERROR, Microsoft's documentation for both patches reads.
Microsoft is addressing the issue using a Known Issue Rollback (KIR), a mechanism introduced in 2021 that lets the Excel giant quietly undo borked non-security updates without user intervention.
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