Windows 11 25H2 Update Causes Application Crashes

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Windows 11 25H2 Update Causes Application Crashes

First seen 12 Oct 2026, 10:29 UTC • •21.9

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ThreatCluster •October 12, 2026 at 22:32 UTC

•Windows 11 25H2 update causes crashes in AC-3 audio decoding applications.
•Affected applications include games and media players using legacy codecs.
•Microsoft is developing a fix and will provide updates soon.

Following the installation of Windows updates released on September 22, 2026 (KB5124010), applications requiring AC-3 audio decoding may close unexpectedly. This issue affects various applications, including games and media players, particularly those relying on legacy audio codecs. The severity of the crashes varies based on application usage, with some failing to launch or crashing during specific activities. Microsoft is aware of the problem and is working on a resolution, promising updates in the future. The issue does not impact many modern applications that utilize their own audio decoding components. Users are advised to monitor for updates regarding this matter.

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Timeline

2026-09-22

Windows updates released

Updates KB5124010 and later were released, leading to application crashes for some users.

2026-10-12

Microsoft acknowledges issue

Microsoft confirmed that applications requiring AC-3 audio decoding may crash and is working on a resolution.

More articles in this cluster (2)

Threat Graph

3 entities, 2 inferred relationships (STIX 2.1).

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Organization (1)

Azure

Affected Platform (2)

Hyper-V
Windows

Relationships

Hyper-V related to Azure
Hyper-V related to Windows

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Common questions

Which applications are affected?

Applications that require AC-3 audio decoding, including certain games and media players, may experience crashes.

Is there a fix available?

No fix is currently available, but Microsoft is working on a resolution and will provide updates soon.

What should users do in the meantime?

Users should monitor for updates from Microsoft regarding this issue and consider using applications that do not rely on AC-3 decoding.

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