Microsoft fixed KB5089549 Windows 11 security update install failures caused by insufficient EFI System Partition space, triggering 0x800f0922 errors. The update includes Netlogon RCE patch and critical Secure Boot certificate rotation.
CVE-2026-41089, a critical Windows Netlogon RCE (CVSS 9.8), is now actively exploited in attacks. The zero-click flaw allows unauthenticated SYSTEM-level code execution on domain controllers. Patch immediately with May 2026 Patch Tuesday updates.
The window between CVE disclosure and active exploitation is now under 5 days for critical vulnerabilities. 131 new CVEs daily, AI-accelerated exploit development, and the NVD backlog are forcing organisations to rethink vulnerability management timelines.
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