New Update Windows 11 August 2026 Patch Tuesday (KB5121003, KB5121000, KB5120240)

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Microsoft just released the August batch of Patch Tuesday updates for Windows 11 26H1, 25H2, 24H2, and 23H2. Windows 11 25H2 and 24H2 versions get the KB5121003 update (manual download link below), build 26200.9168 on 25H2, and build 26100.9168 on 24H2. The 23H2 version gets the KB5120240 update, while 26H1 gets KB5121000 (build 28000.2704).

Here's what's new in the KB5121003 update for Windows 11 25H2 and 24H2:
  • [Security updates] This update provides security improvements. For more information about the security vulnerabilities resolved by this update, see the Security Update Guide
  • [Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
Here's what's new in the KB5121000 update for Windows 11 26H1:
  • [Device] This update improves TPM maintenance reporting by ensuring that EK certificate status is reported accurately.
  • [Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
Here's what's new in the KB5120240 update for Windows 11 23H2:
  • [Connectivity] This update refreshes the COSA profile for SolNet-Mobile to support the latest mobile operator settings.
  • [Device Management] This update improves reliability for devices managed through mobile device management (MDM) by helping devices continue to perform normally when an MDM certificate expires.
  • [File History] This update improves the reliability of File History backups to SMB network shares, helping scheduled backups access network locations and copy files as expected.
  • [Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
  • [Emoji Panel] The emoji panel (Windows key + period (.)) now supports GIPHY following the deprecation of Google's Tenor API.
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Gandalf_The_Grey said:
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Verification needed

The information in the quoted post cannot be independently confirmed from the text alone. It refers to an August 2026 release and KB numbers that should be checked against Microsoft’s official sources before installation or reposting.

In particular:

  • Verify KB5121003, KB5120240, and KB5121000 in the official Windows 11 update history.
  • Check the corresponding entries in the Microsoft Update Catalog.
  • Confirm that the stated build numbers match Microsoft’s documentation for the specific Windows edition and release channel.
  • Use the Microsoft Security Response Center guide for vulnerability details rather than relying solely on a third-party article.

The Secure Boot certificate rollout is a legitimate type of Windows servicing activity, but its availability can depend on device eligibility, firmware, management status, and staged deployment. It should not be assumed that every compatible PC will receive it simultaneously.

Until Microsoft publishes matching KB pages and update-catalog entries, these details should be treated as unverified.
 
Microsoft Releases August 2026 Patch Tuesday Updates
Microsoft has just released the August 2026 Patch Tuesday updates for all supported versions of Windows 11. The KB5121000 update for the version 26H1 of the OS brings the new Screen tint accessibility feature, the “quieter” Widgets experience, and the ability to pause Windows Updates for up to 35 days, which were all previously rolled out to Windows 11 versions 25H2 and 24H2 last month.

The KB5121003 update for Windows 11 versions 25H2 and 24H2, however, includes new gesture controls for PCs with precision touchpads, Windows Update improvements, and more. You can see the highlights below; keep in mind that these features will be rolling out gradually.

New gesture controls for precision touchpads: On PCs with precision touchpads, there are new controls for adjusting the baseline speed for scroll and zoom gestures and enabling accelerated scrolling for faster navigation through long documents in Settings > Bluetooth & devices > Touchpad.

Windows Hello improvements: Windows Hello Enhanced Sign-in Security (ESS) now supports peripheral fingerprint sensors.

Widgets improvements: Taskbar notification badges now use the Windows accent color instead of appearing red. To reduce distractions on the Lock Screen, the Weather widget will now be the only one to be shown by default.

Windows Search improvements: This update improves app search and Settings relevance to better handle typos and partial names for finding installed apps and relevant settings.

Voice Access improvements: The Voice Access accessibility feature now supports Voice Isolation to reduce interference from other speakers and background noise.

Windows Update improvements: This update improves calculation of update progression in Windows Update Settings. It also improves clean-up logic to optimize system performance after installing an update.

Power improvements: This update restores the ability to set a threshold for when the energy saver feature should enable within Settings > System > Power & Battery.

On the security front, Microsoft is now fixing many more vulnerabilities across Windows components, Office apps, and more thanks to its use of AI. The security experts at the Zero Day Initiative mentioned a total of 398 CVEs (Common Vulnerabilities and Exposures) that have been addressed this month, with 62 of them rated ‘Critical’, and just one ‘Important’ flaw that’s being actively used by attackers to execute code at system level.
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www.thurrott.com

Microsoft Releases August 2026 Patch Tuesday Updates

The August 2026 Patch Tuesday updates for Windows 11 bring new gesture controls on PCs with precision touchpads, support for Windows Hello authentication on peripheral fingerprint sensors, and more.
www.thurrott.com www.thurrott.com

August 11, 2026—KB5121003 (OS Builds 26200.9168 and 26100.9168) | Microsoft Support

August 11, 2026—KB5121003 (OS Builds 26200.9168 and 26100.9168)
support.microsoft.com support.microsoft.com

August 11, 2026—KB5121000 (OS Build 28000.2704) | Microsoft Support

August 11, 2026—KB5121000 (OS Build 28000.2704)
support.microsoft.com support.microsoft.com

August 11, 2026—KB5120240 (OS Build 22631.7517) | Microsoft Support

August 11, 2026—KB5120240 (OS Build 22631.7517)
support.microsoft.com support.microsoft.com
 
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Microsoft has acknowledged that its latest Patch Tuesday update for Windows 11 is causing games to crash on some systems. The KB5121003 update, released on August 11 for builds 26200.9168 and 26100.9168, introduces a bug that leads to game crashes with an EXCEPTION_ACCESS_VIOLATION error.

In some cases, the PC reboots automatically after the crash. Microsoft says the problem affects Windows 11 versions 25H2 and 24H2 and is looking into whether the update itself or conflicting third-party software is to blame.

Games affected by the bug include Arc Raiders, Marvel Tokon: Fighting Souls, and The Finals.

Windows 11 KB5121003 Crash Reports and Arm App Problems​

After a Reddit user reported the problem last week, others confirmed they were seeing crashes, error messages, and random reboots after installing the update.

One user shared event logs, WER reports, and a kernel dump analysis that suggested the game crashes were actually system BSODs happening while playing Arc Raiders.

According to the analysis, the crashes are linked to a pre-existing "bad-handle bug" that Windows used to ignore or just return an error for when an invalid handle was closed.

With the latest update, kernel handle validation is stricter, so closing an invalid handle now triggers a bug check 0x93 INVALID_KERNEL_HANDLE instead of being ignored. Microsoft has confirmed the issue on its Windows release health dashboard and is investigating what is causing it.

The update is also causing problems beyond game crashes. According to a Microsoft Learn post by Brian Stringfellow, Teams and the new Outlook have stopped working on Arm devices after installing KB5121003.

Teams crashes shortly after opening, and the new Outlook does not launch, though the classic Outlook app still works as expected.

Stringfellow reports the issue on a Snapdragon-powered Microsoft Surface Laptop 7th Edition. He notes that the same problem showed up earlier this year after installing KB5094126 and was fixed by rolling back that update, but it has returned with the latest release. Other users have confirmed similar issues on the HP OmniBook 3 and Surface Pro 11, both using Arm64 processors.

KB5121003 Workarounds and Microsoft's Fix Status​

Microsoft has not provided an official workaround, but some users have shared steps that worked for them:

  1. Roll back KB5121003 using DISM, which one user reports stopped the crashes.
  2. Pause Windows Update for up to one month to prevent the update from automatically reinstalling.
  3. As a longer-term fix, remove old drivers responsible for the bad-handle bug, which one user recommends as a permanent solution.
  4. On affected Arm devices, use the classic Outlook app, which continues to work, while Teams and the new Outlook remain broken.
These steps are user-reported and not from Microsoft, so results may vary. Microsoft has confirmed the game crash issue on Windows 11 25H2 and 24H2 and is still investigating whether the update or third-party software is responsible.

There is no fix or official workaround yet. Microsoft has also not responded to the separate reports about Teams and new Outlook not working on Arm devices. Users can check the Windows release health dashboard for updates or roll back the update for now.
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www.ghacks.net

Microsoft Confirms Windows 11 KB5121003 Update Is Crashing Games and Rebooting PCs - gHacks Tech News

Microsoft confirms its KB5121003 Windows 11 update is crashing games like Arc Raiders and rebooting some PCs, and is investigating.
www.ghacks.net www.ghacks.net
 
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Microsoft has confirmed that its August 2026 .NET Framework cumulative updates are causing printing failures and PDF/XPS generation errors in Windows Presentation Foundation (WPF) applications, creating fresh headaches for enterprises just days after patching a batch of security flaws.

The issue stems from the August 2026 updates released on August 11, 2026, including KB5120710 for Windows 11 version 24H2, KB5120708 for Windows 11 version 25H2 and Microsoft server operating system 24H2, and KB5120705 for Windows Server 2022.

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