The usual windows update deal: fix one for the price of breaking two.
this post was submitted on 03 May 2026
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Warning, Windows code base has become such a mess that it is unmanageable - expect every update to break something 😅
They blocked a known vulnerable driver and you have to update your backup software if they were using that driver.
Yeah the real question is why the backup software companies are choosing to use a known vulnerable kernel driver.
The quote from the article:
I reached out to Microsoft for a statement and a spokesperson proviued the following: “In the April 2026 Windows security update, we added known vulnerable kernel driver psmounterex.sys to the Vulnerable Driver Blocklist. Backup applications that rely on this driver may experience failures when attempting to mount or manage disk images. We do not recommend uninstalling or pausing this update. Customers with an impacted driver should install the latest application versions and validate against the driver blocklist to remain protected. For more information, please see here.”
They are as good as their Word™
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