cumulative update

Winsage
September 17, 2026
On September 14, 2026, Microsoft released KB5129195, an out-of-band cumulative update for Windows 11 versions 24H2 and 25H2, transitioning systems to build 26100.9457 for 24H2 and 26200.9457 for 25H2. The update addresses several regressions, including failed connections and sign-ins in Remote Desktop Services, host-folder sharing failures in Plan9 file sharing for HCS-managed Linux virtual machines, and failures affecting 8-channel and 3D-audio modes in USB Audio Class 1.0. However, it does not fix ongoing issues with AMD Radeon graphics cards, such as freezes, black screens, and driver timeouts, which have affected various hardware configurations. KB5129195 is available through multiple distribution channels, including Windows Update and WSUS.
Winsage
September 10, 2026
Microsoft acknowledged an issue with the KB5120998 August 2026 preview update for Windows 11, where mouse settings related to cursor personalization were altered or reset. This problem affected non-English Windows installations, causing personalized settings to fail to load and revert to standard configurations. The issue was resolved in the subsequent KB5124008 September 2026 cumulative update, which users were encouraged to install. KB5120998 was an optional update, potentially limiting the number of affected users. Additionally, Microsoft has been addressing various mouse-related issues in recent months, including problems with the Windows Recovery Environment and disappearing mouse pointers in Outlook.
Winsage
September 10, 2026
Microsoft announced that the September 2026 Patch Tuesday updates resolved an issue affecting desktop settings on certain Windows devices, which caused desktop wallpapers to revert to a solid black background after the installation of the KB5120998 August 2026 preview update. This bug impacted Windows 11 24H2 and 25H2 systems, preventing the correct loading of desktop settings and also affecting mouse settings. Microsoft recommended users update their devices to the latest security update released on September 8, 2026 (KB5124008) to benefit from the fix.
Winsage
September 9, 2026
On September 8, 2026, Microsoft disclosed a security vulnerability identified as CVE-2026-69449, related to a heap-based buffer overflow in the Windows BitLocker component, allowing authorized attackers to execute code on compromised machines. The vulnerability is classified as CWE-122, and is assessed as “Exploitation Less Likely.” It affects Windows 10, Windows 11, and Windows Server versions from 2012 to 2025. The fixes are included in cumulative updates KB5124008, KB5124012, KB5122878, and KB5122871. No public disclosure or observed exploitation occurred before the patch's release. The flaw allows for remote code execution through in-network attacks, primarily posing a risk to insiders. Affected systems include various versions of Windows 10, Windows 11, and Windows Server, applicable to both x64 and ARM64 architectures. Administrators should verify installed build numbers to ensure updates have been applied. The advisory does not specify which BitLocker code path is affected or the nature of the input that reaches the vulnerable buffer.
Winsage
August 25, 2026
Microsoft has acknowledged that users may encounter printing issues after installing the August 2026 .NET Framework cumulative update, particularly with applications that use certain fonts like Calibri. Some WPF applications may fail with a System.IO.FileFormatException when printing or generating PDF/XPS content. Microsoft has provided a temporary workaround while investigating these issues. Additionally, the KB5121003 update has been linked to problems affecting the gaming community, which Microsoft is also addressing.
Winsage
August 25, 2026
Microsoft has acknowledged a significant issue with the .NET Framework updates from August 2026, causing disruptions in printing and PDF export functionalities in certain applications, particularly those using the Windows Presentation Foundation (WPF) UI framework. After installing the update, some WPF applications may encounter a System.IO.FileFormatException when printing or generating PDF/XPS content with specific fonts, including Calibri. This issue affects various platforms, including Windows 10, Windows 11, and Windows Server editions from 2012 to 2025. Microsoft has provided a temporary workaround involving the Switch.MS.Internal.TtfDelta.DisableCmapAndSbitOverflowProtection AppContext switch, but cautions that it may expose systems to vulnerabilities. This situation is reminiscent of a similar incident in February 2021, where WPF applications and Visual Studio experienced crashes after Windows 10 cumulative updates. Additionally, on the same day, Microsoft offered a workaround for another issue caused by Windows 11 updates that led to crashes in certain games.
Winsage
August 24, 2026
The cumulative update for Windows 11, KB5121003, has caused game freezes and crashes for users, attributed to conflicts with third-party software and drivers managing RGB components, particularly related to the inpoutx64.sys file. Affected games include ARC Raiders, MARVEL Tōkon: Fighting Souls, and THE FINALS, with symptoms such as unresponsive games, sudden closures with an EXCEPTIONACCESSVIOLATION message, and unexpected system reboots. Microsoft has not provided a permanent fix but suggests users report issues via the Windows 11 Feedback Hub and consider removing or renaming the problematic driver as a temporary measure.
Winsage
August 20, 2026
Microsoft has released a guide for IT administrators focused on optimizing Windows deployments and reducing bandwidth usage through Windows Delivery Optimization configured via Microsoft Intune. Delivery Optimization uses a peer-to-peer sharing system, allowing devices to download content from each other instead of solely from Microsoft servers, which helps reduce internet strain for organizations with many Windows PCs. Administrators can create specific peer groups based on network topology and control bandwidth usage for downloads, with options to set different limits for business and off-hours. Microsoft also introduced Connected Cache, which stores frequently accessed content locally to further minimize bandwidth consumption. A statistic shared by Microsoft indicates that using Delivery Optimization can significantly reduce internet traffic, as a 1 GB update for 10,000 devices could otherwise generate 10 TB of internet traffic. The guide recommends starting with a small seeder ring of devices to populate peer caches before wider deployment. Microsoft provides specific policy settings for Delivery Optimization, including default and recommended values for settings such as download mode, peer selection, cache size, minimum file size for caching, cache age, and monthly upload data cap. Proper configuration of Delivery Optimization is suggested to benefit organizations managing large numbers of devices.
Winsage
August 17, 2026
Microsoft has transitioned its newly designed Print Management tool into the Release Preview channel for Windows 11, moving it closer to general availability after initial appearances in Beta and Experimental builds. The new Print Management app, built on WinUI 3, replaces the outdated MMC-style console and features a modern layout with a user-friendly interface. It serves as a comprehensive management system for administrators, allowing oversight of printers, print queues, drivers, ports, and print servers. The rollout schedule includes an optional update anticipated for late August and integration into the regular September cumulative update. However, the timeline may be subject to delays. The updated application maintains essential administrative functionality while simplifying tasks such as renaming printers and customizing displayed information. Some legacy elements remain, requiring administrative privileges to launch the app. Microsoft is actively modernizing Windows 11's user interface, including the Print Management tool, as part of a broader initiative to replace outdated components.
AppWizard
August 16, 2026
Windows 11 update KB5121003, released in August 2026, addresses over 400 vulnerabilities but has caused crashes in games like ARC Raiders and The Finals. The game studio Embark has confirmed that the crashes are linked to the inpoutx64.sys driver, which has compatibility issues due to the update. Users have reported errors such as “Hang detected on GameThread” and “EXCEPTIONACCESSVIOLATION” after installing the update. Embark has provided a workaround to stop and delete the inpoutx64.sys service to resolve the crashes. Uninstalling the update also appears to fix the issue. Additional reports indicate crashes in other games and graphics-related problems following the update.
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