secure boot

Microsoft is replacing the original 2011 Secure Boot certificate chain across Windows PCs and servers before certificates begin expiring in June 2026 and continue expiring into October, affecting supported Windows 10, Windows 11, and Windows Server systems that still trust those aging boot...

Microsoft acknowledged on May 15, 2026 that Windows 11 security update KB5089549, released for versions 24H2 and 25H2, can fail during installation with error 0x800f0922 on devices whose EFI System Partition has very little free space. That detail matters because this is not just another vague...

Microsoft’s May 12, 2026 Windows 11 cumulative update KB5089549 adds a new C:\Windows\SecureBoot folder on eligible PCs, packaging sample PowerShell automation for the Secure Boot certificate migration that organizations must complete before older 2011-era trust certificates begin expiring in...

Microsoft’s June 2026 Secure Boot certificate deadline affects most Windows devices that still depend on Microsoft’s 2011-era boot trust certificates, and the immediate fix is installing current Windows updates, allowing the machine to restart, and leaving the new Secure Boot remediation files...

Microsoft’s May 12, 2026 Windows 11 security update KB5089549 fixes a BitLocker recovery problem caused by April boot-file changes, but Microsoft added a May 15 warning that some PCs with cramped EFI System Partitions may fail installation with error 0x800f0922. That is the most Windows update...

Microsoft’s May 12, 2026 Windows 10 extended security update, KB5087544, adds Secure Boot status reporting to the Windows Security app before Microsoft’s original 2011 Secure Boot certificates begin expiring in June 2026 across many Windows devices. The update is not just another Patch Tuesday...

Microsoft released KB5087544 on May 12, 2026, for Windows 10 Enterprise LTSC 2021, Windows 10 IoT Enterprise LTSC 2021, and eligible Extended Security Updates systems, fixing May Patch Tuesday security flaws while correcting Remote Desktop warning behavior and Secure Boot reporting. The update...

Microsoft’s May 18 Secure Boot AMA is aimed squarely at IT administrators preparing for the June 2026 expiration of older Windows Secure Boot certificates, and one enterprise question now captures the central deployment dilemma: whether successful OEM firmware updates can stand in for...

Microsoft released Windows 11 cumulative updates KB5089549 and KB5087420 on May 12, 2026, moving versions 25H2 and 24H2 to builds 26200.8457 and 26100.8457, and version 23H2 to build 22631.7079, across its regular Patch Tuesday servicing channels. The headline is security, but the story is...

Microsoft released Windows 10 KB5087544 on May 12, 2026, as the May Patch Tuesday cumulative security update for Windows 10 22H2 ESU systems, raising supported 22H2 machines to build 19045.7291 and adding new Secure Boot status reporting in the Windows Security app. The update is not a feature...

Microsoft disclosed CVE-2026-41097 on May 12, 2026, as an Important Secure Boot security feature bypass affecting supported Windows client and server releases, with required security updates available and Microsoft saying the issue is not publicly disclosed or exploited. The vulnerability is not...

Microsoft published KB5087594 on May 12, 2026 as a Safe OS Dynamic Update for Windows 11 version 23H2, tying another servicing package to the larger Secure Boot certificate rollover that begins affecting Windows devices in June 2026. The update itself is not a flashy feature release; it is...

Microsoft released KB5089593 on May 12, 2026, as a Safe OS Dynamic Update for Windows 11 versions 24H2 and 25H2, updating the Windows Recovery Environment while again warning that Secure Boot certificates used by most Windows devices begin expiring in June 2026. The smallness of the package is...

Microsoft released KB5089549 on May 12, 2026, as the monthly cumulative security update for Windows 11 versions 25H2 and 24H2, moving systems to OS builds 26200.8457 and 26100.8457 while bundling security fixes, servicing-stack changes, and selected reliability improvements. The update looks...

Microsoft released the May 12, 2026 Windows 11 security update KB5089549 for versions 25H2 and 24H2, moving supported systems to OS builds 26200.8457 and 26100.8457 while also publishing standalone catalog packages that require ordered MSU handling for manual deployment. The update is not just...

Microsoft is preparing Windows PCs for the first expiration of the original Secure Boot certificates issued in 2011, with the affected certificates beginning to age out in June 2026 and Windows Update now delivering replacement 2023-era trust material to supported devices. The visible symptom...

Microsoft’s Secure Boot certificate rollover is reaching ordinary Windows PCs in May 2026, with some devices getting a one-time extra restart as Windows Update installs replacement boot-trust certificates before the first 2011-era certificates begin expiring in June. The restart is the visible...

Microsoft’s Secure Boot certificate rollover begins in June 2026, just eight months after Windows 10 left mainstream support on October 14, 2025, and Google is using that timing to pitch ChromeOS Flex as a free way to keep older Windows PCs useful. The sales line is simple: if Windows 11 will...

Microsoft is preparing Windows PCs for a Secure Boot certificate rollover beginning in late June 2026, when original 2011-era certificates start expiring and unsupported Windows 10 systems outside Extended Security Updates will not receive the replacement certificates. This is not a theatrical...

Microsoft has confirmed that some Windows 11 PCs may restart more than once while installing recent and upcoming updates in spring 2026 because Windows is applying Secure Boot 2023 certificate changes before older 2011 certificates begin expiring in June 2026. That is the plain answer to the...