If Windows 11 games or apps started crashing after a recent update, Microsoft says installing the October update, KB5127648, fixes it. The problem hit apps that use Windows' built-in AC-3 (Dolby Digital) audio decoding, after optional preview update KB5124010 from September 22.
Microsoft has marked the issue resolved on its Windows release health dashboard and recommends installing the latest update.
How do I fix the crashes?
- Open Settings.
- Go to Windows Update.
- Click Check for updates.
- Install KB5127648 (October 13, 2026) or anything newer.
- Restart your PC.
That's it. Microsoft has not documented any other workaround, and you don't need to uninstall the older update.
What was the bug?
According to Microsoft and BleepingComputer:
| Detail | |
|---|---|
| Caused by | KB5124010 (Sept 22, 2026 preview update) or later |
| Fixed by | KB5127648 (Oct 13, 2026) or later |
| Affected | Windows 11 24H2, 25H2, 26H2 |
| Not affected | Windows Server |
| Apps hit | Games, media players, some productivity apps using Windows' AC-3 decoder |
Symptoms: apps fail to launch, close without warning, or crash when you use a specific feature, such as playing music. Mostly older apps were affected; many modern apps bundle their own audio decoder.
Why did my PC install an optional update?
KB5124010 was a preview update. It installs automatically only if you've turned on "Get the latest updates as soon as they're available" in Windows Update. Turn that off if you'd rather wait for fully tested monthly updates.
Still crashing after updating?
- Update the game or app itself.
- Update your audio drivers from your PC or sound-card maker.
- Try a different audio output format in the game's settings if it offers one.
Is Windows 11 having more update problems?
Audio has been a repeat trouble spot. Microsoft shipped emergency fixes in September for USB audio issues caused by two other updates, and October Windows Server updates broke Exchange sign-in and mail flow for some organizations. If you're also deciding what to do about older Windows 11 versions, see our guide to Windows 11 24H2 end of support.
