Microsoft says Samsung Galaxy app bug, not Windows update, locked some users out of C: drive

[midian182]

Facepalm: In what looked like yet another Windows update horror story, Samsung PC owners started reporting that their systems were suddenly refusing access to the C: drive. Affected users saw "Access denied" messages that were breaking everything from Outlook and Office to browsers, system tools, and Quick Assist. But Microsoft is pointing the finger elsewhere.

Because the failures appeared around March Patch Tuesday and followed recent security updates, plenty of people blamed Microsoft's latest patches. Now, the company says the real culprit was not Windows itself, but Samsung software.

Microsoft has added the issue to its release health pages for Windows 11 24H2 and 25H2, where it says some Samsung devices lost access to the system drive after installing the February 2026 security update KB5077181 and later updates.

Image credit: Vishuakade (Samsung forums)

That timing made the bug look update-related, especially as reports continued into March. But after investigating with Samsung, Microsoft says the symptoms were actually caused by a problem in the Samsung Galaxy Connect app, not by current or previous monthly Windows updates.

"Microsoft and Samsung investigated these reports and concluded that the symptoms were caused by an issue in the Samsung Galaxy Connect app. While the reports coincided with recent March Patch Tuesday timing, investigation confirmed the issue is not caused by current or previous Windows monthly updates," Microsoft wrote.

The scope seems fairly specific, though that will be little comfort to those impacted. Microsoft says the problem has been observed on certain Samsung Galaxy Book 4 laptops and some Samsung desktop models running Windows 11 versions 24H2 and 25H2.

The bug can cause users to lose access to files on the boot drive, apps to stop launching, and in some cases even basic administrative tasks become difficult or impossible.

Microsoft says the affected version of Galaxy Connect has now been temporarily removed from the Microsoft Store, while Samsung has republished an older stable version of its Galaxy app to keep more systems from being caught out.

The bad news, according to the Redmond firm, is that recovery options for PCs that are already affected are limited, which suggests anyone already locked out of C:\ may still be in for a frustrating time. Microsoft said it is "collaborating with Samsung's efforts to develop and validate solutions."

The episode is still a bad look for Microsoft, even if Samsung appears to have supplied the broken component. When a bug surfaces immediately after a Windows security update and leaves users unable to access their system drive, most people are not going to stop and wonder whether a preloaded OEM utility was the real problem. They are going to blame Windows first – understandably so. This time, though, Microsoft says the timing only made the update seem like the culprit.

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Microsoft says Samsung Galaxy app bug, not Windows update, locked some users out of C: drive

 

[NumberNine]

I think it's important to acknowledge that the problem couldn't possibly have manifested without Samsung writing garbage code and Microsoft publishing it (on their most trusted and 'modern' of storefronts no less). Everyone screwed up, quality assurance did not assure the quality.

 

[yRaz]

A windows update made Samsung's failure possible

 

[MasterAce]

The user is just a guest in their own windows system while any corp out there can do whatever they want on people's windows with maximum credentials, such as lock the user out of drive C by mistake

 

[Endymio]

I think it's important to acknowledge that the problem couldn't possibly have manifested [without] Microsoft publishing it (on their most trusted and 'modern' of storefronts no less). Everyone screwed up...

Thought processes like this sadden me. Do you really want a world where all Windows applications and libraries must first have their source code sent to MS for an expensive, months-long validation process before you're allowed to run it? Even Apple's App store (source of countless complaints over its restrictive policies) doesn't QA apps -- it merely scans them for the most obvious security violations.

The user is just a guest in their own windows system while any corp out there can do whatever they want on people's windows with maximum credentials

Perhaps you could ask your local congressman to repeal the law requiring you to download and run Samsung apps on your PC?

 

[MasterAce]

Thought processes like this sadden me. Do you really want a world where all Windows applications and libraries must first have their source code sent to MS for an expensive, months-long validation process before you're allowed to run it? Even Apple's App store (source of countless complaints over its restrictive policies) doesn't QA apps -- it merely scans them for the most obvious security violations.


Perhaps you could ask your local congressman to repeal the law requiring you to download and run Samsung apps on your PC?

I'm not talking about politics. Obviously its a Samsung computer, so it comes preinstalled with that software. I'm merely pointing out that we buy computers and we don't even own them anymore

 

[Endymio]

I'm not talking about politics. Obviously its a Samsung computer, so it comes preinstalled with that software. I'm merely pointing out that we buy computers and we don't even own them anymore

How so? Samsung doesn't require anyone to download their Galaxy Connect app. And they even allow you an option to use it with automatic updates disabled, so that situations like this don't occur.

 

[Theinsanegamer]

Thought processes like this sadden me. Do you really want a world where all Windows applications and libraries must first have their source code sent to MS for an expensive, months-long validation process before you're allowed to run it? Even Apple's App store (source of countless complaints over its restrictive policies) doesn't QA apps -- it merely scans them for the most obvious security violations.


Perhaps you could ask your local congressman to repeal the law requiring you to download and run Samsung apps on your PC?

Thought processes like this sadden me. Do you really want a world where any corpo can push out broken updates, locking you out of all the data on your PC with no recourse? Do we need to keep making excuses to meatshield for megacorpos?

 

[daffy duck]

Scamsunbg are well known to have the worst software writers on the planet. So what a match made in hell when you combine Microslop and Scamsung.