Microsoft Links Windows 11 Boot Failures to Failed December 2025 Security Update
MicrosoftWindows_11boot_failuresecurity_updatesoftware_bugsystem_errorDecember_2025January_2026
Microsoft has identified a connection between Windows 11 boot failures occurring after the installation of January 2026 updates and previous attempts to install the December 2025 security update. These unsuccessful attempts left systems in an "improper state," causing boot malfunctions. The issue affects Windows 11 devices that encountered errors while applying the December 2025 update. No reference to a CVE or additional technical details is mentioned.