Microsoft has issued a warning about blue screen crashes caused by secure kernel fatal errors following updates released since March for Windows 11, version 24H2. Affected users may encounter the error code 0x18B after installing updates and restarting their devices, but a Known Issue Rollback (KIR) will automatically resolve the issue for most users within 24 hours. Windows admins for enterprise-managed devices will need to manually apply a Group Policy to address the problem.