The KB5124010 crash is real, and Microsoft has confirmed it. The September preview update can make some older Windows 11 games and apps close without warning when they use Dolby Digital (AC-3) audio. If you haven’t installed the update, you can simply skip it for now.
Here are the quick facts:
- Affected: Windows 11 24H2, 25H2 and 26H2, according to gHacks.
- Trigger: apps that use Windows’ built-in AC-3 (Dolby Digital) audio decoder.
- Workaround: none from Microsoft so far.
- Fix date: not announced.
- Update type: optional preview, released September 22.
If you only skim one section, make it the one on avoiding the update. It takes under a minute.
What the KB5124010 crash actually does to your apps
Microsoft says the crash depends on what the program is doing. Some apps fail to launch at all. Others run fine until you use a feature that touches AC-3 audio, such as playing music, and then they shut down.
Microsoft hasn’t named any specific games or apps. It says the list includes games, media players and some productivity apps, per BleepingComputer. It also hasn’t explained the root cause.
Windows Latest adds that raising the volume or changing audio settings can set the crash off, per its report on the bug. That makes it hard to predict, which is why prevention beats troubleshooting here.
AC-3 is the audio format behind Dolby Digital surround sound, common in older games and video files. Windows includes a decoder so apps don’t have to ship their own. When that decoder misbehaves, every app relying on it can go down with it.
Which games and apps are most at risk
The bug sits in the Dolby Digital decoder that ships with Windows. Microsoft says many modern apps are fine because they bring their own decoding components. Older software that leans on the built-in decoder is the likely casualty.
| Type of software | Risk level | Why |
|---|---|---|
| Modern apps with their own audio decoder | Low | They don’t rely on the Windows AC-3 decoder, per Microsoft. |
| Older games and media players | Higher | They often use the built-in decoder for Dolby Digital sound. |
| Productivity apps with media playback | Possible | Microsoft lists some productivity apps, without naming them. |
Treat the table as a guide, not a guarantee. Microsoft hasn’t published a full list, so a legacy app that closes during audio is a good suspect.
One more wrinkle: if you installed KB5124010 on 25H2 and later moved to 26H2, you may still be affected, since these versions share code. Windows Latest flagged that case.
How to avoid the bug (or check if you have it)
Microsoft hasn’t offered a workaround or a rollback. Here’s what you can do yourself:
- In Windows Update, don’t click “Download and install” on KB5124010. It’s optional, so Windows won’t force it on you.
- On 24H2, turn off “Get the latest updates as soon as they’re available.” BleepingComputer says that setting installs the preview automatically.
- If an old app now closes during audio, open Update history and look for KB5124010.
Why this matters: skipping a preview update costs you very little, since its changes reach everyone later through a regular monthly update. gHacks notes the same trade-off. We broke down what the preview adds in our KB5124010 guide.
Microsoft hasn’t published removal steps for this update. If you want to roll it back, the usual route is Update history in Settings. Check that it’s offered there before you rely on it.
Gamers should pay the most attention. Older titles with surround sound are the likeliest to hit the decoder, and a crash mid-session can cost you unsaved progress. Keep your save files backed up if you must install the update.
Will the October 13 update fix it?
Nobody knows yet. Microsoft says it is working on a resolution “in a future Windows update,” and it hasn’t said whether Patch Tuesday on October 13 includes it, per gHacks.
There’s a catch. Preview changes normally roll into the next Patch Tuesday release, so the bug could reach more PCs if it isn’t fixed first. That’s my reading of how Windows servicing usually works, not a Microsoft statement.
Windows 11 has had a rough few weeks. Last month Microsoft pushed emergency updates for USB audio, Remote Desktop and Hyper-V problems, per BleepingComputer, and this bug is separate from the USB audio one, according to Windows Latest. If you’re still choosing a feature update, our Windows 11 26H2 guide covers what to know first.
Frequently Asked Questions
Is KB5124010 safe to install?
It’s safe for most people, but it can crash older games and apps that use Dolby Digital audio. If you run legacy software, wait for Microsoft’s fix.
Which Windows 11 versions have the crash bug?
Microsoft lists 24H2, 25H2 and 26H2. Windows Server isn’t listed, according to gHacks.
How do I know if an app uses AC-3 audio?
You usually can’t tell from the app itself. If an older game or player closes during sound or music after the update, assume it’s affected.
Is there a Known Issue Rollback for this bug?
Not as of the latest reports. Microsoft hasn’t offered a rollback or a workaround, only a promise of a future fix.
My take: skip it for now
If you play older games or use legacy media software, leave KB5124010 alone and wait for the fix. The update’s extras, like Copilot key remapping, aren’t worth a random crash. If your PC runs only modern apps, the risk is small, but there’s still no rush to install an optional preview.
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