windows 11 security update

  1. KB5083769 Blocks psmounterex.sys: Fix Backup Image Mount Failures

    Microsoft’s April 14, 2026 Windows 11 security update KB5083769 deliberately blocks vulnerable versions of the psmounterex.sys kernel driver, causing some third-party backup tools on Windows 11, Windows 10, and Windows Server to fail when mounting or managing backup images. The immediate fix is...
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    • backup image mounting code integrity enforcement psmounterex.sys driver blocklist windows 11 security update
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    • Forum: Windows News