Windows 11 KB5077181 Update Triggers Infinite Restart Loops on Some Devices
On February 10, 2026, Microsoft released the KB5077181 security update for Windows 11 versions 24H2 (build 26200.7840) and 25H2 (build 26100.7840). This update aimed to deliver essential security fixes and quality improvements. However, shortly after deployment, numerous users began reporting critical boot failures, with devices entering continuous restart loops that often exceeded 15 cycles, effectively preventing access to the desktop environment.
Key Features of KB5077181:
– Security Enhancements: The update addressed 58 vulnerabilities across various Windows components, including six zero-day exploits actively being used in the wild. Notable patches included:
– CVE-2026-21510: A security feature bypass in Windows Shell that allowed attackers to evade SmartScreen protections via malicious links.
– CVE-2026-21519: An elevation of privilege vulnerability in the Desktop Window Manager, enabling attackers to gain SYSTEM-level access.
– CVE-2026-21533: An elevation of privilege flaw in Windows Remote Desktop Services, identified as an exploited zero-day vulnerability.
– CVE-2026-20841: A remote code execution vulnerability in Notepad, exploitable through crafted Markdown files.
– Secure Boot Certificates: The update introduced new Secure Boot certificates to preempt the expiration of 2011 certificates scheduled for June 2026, thereby enhancing boot integrity.
– Additional Fixes: Improvements were made to gaming eligibility checks and WPA3 Wi-Fi connectivity issues.
Reported Issues:
Despite these enhancements, users have encountered significant problems post-installation:
– Infinite Restart Loops: Devices repeatedly restart, preventing users from reaching the desktop.
– System Errors: At login, errors such as a specified procedure could not be found related to the System Event Notification Service (SENS) appear.
– Network Connectivity Issues: Despite active connections, DHCP failures result in loss of internet access.
– Installation Errors: Errors like 0x800f0983 and 0x800f0991 occur during the update process, particularly on specific hardware configurations.
These issues have been widely discussed on platforms such as Reddit, Microsoft Answers, and ElevenForum, with numerous users sharing their experiences and seeking solutions.
Recommended Workarounds:
To mitigate these issues, users can take the following steps:
1. Uninstall KB5077181:
– Navigate to Control Panel > Programs and Features > View installed updates.
– Select KB5077181 and choose to uninstall it.
– Restart the device and pause Windows Update to prevent reinstallation.
2. Use Windows Recovery Environment:
– If the device is stuck in a boot loop, enter the Windows Recovery Environment by interrupting the boot process three times or using installation media.
– Select Troubleshoot > Advanced options > Command Prompt.
– Execute the following command:
“`
wusa /uninstall /kb:5077181 /quiet /norestart
“`
– After uninstallation, run:
“`
sfc /scannow
“`
to repair system files if necessary.
Enterprise Considerations:
Organizations deploying this update via Windows Server Update Services (WSUS) should:
– Test Deployments: Conduct thorough testing in controlled environments before widespread deployment.
– Monitor Systems: Keep a close watch on system performance and user reports post-update.
– Stay Informed: Regularly check Microsoft’s release health dashboard for updates and potential fixes.
Conclusion:
While the KB5077181 update introduces critical security enhancements and system improvements, the associated boot failures and restart loops have caused significant disruptions for many users. Microsoft has yet to officially acknowledge these issues as of February 15, 2026. Users are advised to exercise caution when applying this update and to implement the recommended workarounds if problems arise.
