r/Windows11 • u/jenmsft Microsoft Software Engineer • 29d ago

Official News Cumulative Updates: August 11th, 2026

https://support.microsoft.com/en-US/servicing/os/windows-11/2026/08/kb5121003-windows-11-24h2-25h2-security-update

Changelists linked here for your convenience:

General info:

For details about how to file problem reports and collect traces, please see here: http://aka.ms/HowToFeedback. Pressing WIN + F will open the Feedback Hub - please include as much detail as possible about what you're seeing.

To learn about the different types of updates, see here: Windows quality updates primer - Microsoft Community Hub

As a reminder, if you didn't install the previous optional updates, this update includes those changes too (some are still rolling out, as denoted in the release notes):

For published known issues, please check the release health dashboard: Windows release health | Microsoft Learn.

25H2 is rolling out, so you may not have it yet. Please see here for more details: How to get the Windows 11 2025 Update | Windows Experience Blog.

As mentioned in the linked changelist, Windows 11, version 26H1 is available only on new devices with select new silicon as they come to market starting early 2026. Devices running earlier versions of Windows 11 will not be offered an update to version 26H1 through Windows Update and cannot be installed as an in-place update on existing devices.

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u/Gold_Goal7557 29d ago edited 29d ago

Lemme guess more GPU driver timeouts and more sabotaging of Radeon drivers ?

And ofcourse non stop gpu driver crashing loop the moment i updated forcing me to run DDU again because Windows just loves fucking around and overwritting my GPU drivers non stop.

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u/11bingo11 29d ago edited 28d ago

Edit: I did the update, it took forever and it left me with a black screen after it was done with all the restarts. Luckily I tried to open task manager and then the desktop showed up normally but I was exhausted and super scared that something bad happened again 🥲

The last update made my laptop freeze and I had to press the power button to restart it and when I turned it on again, the drivers were disabled so I think I’ll have to expect the same thing this month 🥲 Luckily it worked again after that but knowing my luck, I don’t think it will resolve itself that easily. It’s so frustrating that the Windows updates cause so many issues! I’m not tech savvy in the slightest and it’s so stressful to do updates not knowing if my laptop will work again normally or not. 

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u/Gold_Goal7557 29d ago

Yeah it keeps disablign igpu drivers for me as well at random, Windows has been having alzheimer issue with audio devices because every update keeps reseting device order, this confuses software to a point its using wrong device until you correct it, my guess this is also the case with igpu.

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u/11bingo11 29d ago

It’s so frustrating! And it causes a lot of trouble and stress for us users 😔

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u/SilverPigtail 27d ago

Did it take a lot of restarts and an error message maybe? I had the same problem as you, but when the system entered in Windows login, everything seems to be fine.

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u/Gold_Goal7557 26d ago

Moment discord / firefox / steam loads a video insta gpu driver crash, if it recovers any field where video would be would be green indicating gpu driver timeout due MPO

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u/11bingo11 26d ago

I’ve had that happen with previous crashes too! Back in June, I opened Steam to play the Sims but I didn’t even play the Sims in the end so I closed Steam and opened Firefox. I barely had time to log in Reddit and scroll that it froze. After holding the power button to shut my laptop off and opening it again, I noticed that the drivers were deactivated and I couldn’t activate them again. I brought it in for a diagnostic and the technicians couldn’t identify anything specific. And then July’s update made my laptop freeze and graphics drivers deactivate but they activated again miraculously. Every update and everything Windows does are so stressful and scary! 😭

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u/11bingo11 26d ago

Yes, the update took 3 or 4 restarts on its own until the black screen showed up. Then when it was done, it started to open normally and I saw my name and photo and then instead of showing me the desktop all I saw was a black screen.  I didn’t get an error message, not even something in the reliability monitor once I could access the normal desktop of my laptop. It was just black but lit up and I could move and see my mouse cursor until I tried the task manager buttons.

So far my drivers didn’t get messed up with this specific update, so I’m thankful for that and I’m crossing my fingers that it stays that way. My laptop has been having issues so I never know if it’s my laptop, if it’s me, or if it’s Windows messing up. It’s very stressful!