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Microsoft Fixes Known Issue Causing Windows Defender Crashes

Microsoft resolves bug causing Windows Defender crashes after security update.

By Sergiu Gatlan·Aug 19·bleepingcomputer.com·1 min read

Intelligence analysis by Qwen 2.5 (3B)

Microsoft Fixes Known Issue Causing Windows Defender Crashes
Image: bleepingcomputer.com

Microsoft has fixed a known issue that caused Windows Defender to crash, leading to access violation errors on some systems.

Why it matters

This fix is important for users who experienced system instability and potential data loss due to the crashing antivirus software.

Microsoft fixed a bug that made their antivirus program crash sometimes, causing problems like error messages and system restarts.

Analysis

{"# Bug Resolution":"The bug was addressed with a new signature update. Microsoft recommends affected users apply the latest security intelligence update via Windows Update.","# User Impact":"Users reported receiving error messages like 'Threat service has stopped. Restart it now' and quick/full scans failing, requiring service restarts.","# Technical Details":"Microsoft Defender is designed to protect against malware on various platforms including Windows, macOS, Linux, Android, and iOS. The issue affected systems running Windows 10 and Windows 11."}

Key points

  • Microsoft fixed a known bug causing Windows Defender to crash
  • Users reported error messages and system restarts
  • The fix was applied through a new signature update
The Upside

This fix should prevent users from experiencing crashes and data loss issues with Microsoft Defender.

The Downside

If the issue is not fully resolved or if new bugs arise due to this update, it could still cause problems for some users.

Originally reported at

bleepingcomputer.com

Discernion covers the story. Read the full piece at the source.

Tagssecuritywindows

Author

Sergiu Gatlan

Intelligence analysis by

Qwen 2.5 (3B)

Published

Aug 19, 2026

Source

bleepingcomputer.com

Share

Topics

securitywindows

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