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Microsoft admits June Windows 10 Patch Tuesday updates causing crashes

Surface Laptop 3 13.5
Surface Laptop 3 13.5 (Image credit: Windows Central)

What you need to know

  • June's Patch Tuesday updates to Windows 10 are causing PCs to crash.
  • The bug is caused by a failure in the Local Security Authority Subsystem Service file Isass.exe.
  • The issue affects devices running Windows 10 version 1809, 1903, 1909, and 2004.

Microsoft confirmed recently that its Windows 10 Patch Tuesday updates in June cause system crashes for some PCs (via ZDNet). The issue is caused by a failure in the Local Security Authority Subsystem Service (LSASS) file Isass.exe. The bug affects PCs running Windows 10 version 1809, 1903, 1909, and 2004. It's unclear how many PCs are affected by the issue at this time, but Microsoft is "working on a resolution and will provide an update in an upcoming release."

Microsoft outlines the problem in the support documents for Windows 10 versions 1809 (opens in new tab), 1903 (opens in new tab), and 2004 (opens in new tab). The support documents state:

The Local Security Authority Subsystem Service (LSASS) file (lsass.exe) might fail on some devices with the error message, "A critical system process, C:\WINDOWS\system32\lsass.exe, failed with status code c0000008. The machine must now be restarted."

Microsoft also states that the out-of-band update that shipped on June 16 is affected by the LSASS issue.

Microsoft is working on a fix for the issue that will "provide an update in an upcoming release." At this time, Microsoft has not confirmed if the issue affects earlier versions of Windows 10.

Microsoft recently announced that optional cumulative updates will resume in July, so there's a chance that a fix for the LSASS issue could roll out in an optional cumulative update.

Sean Endicott
News Writer and apps editor

Sean Endicott brings nearly a decade of experience covering Microsoft and Windows news to Windows Central. He joined our team in 2017 as an app reviewer and now heads up our day-to-day news coverage. If you have a news tip or an app to review, hit him up at (opens in new tab).

  • I must be the luckiest man in the world regarding problems with patches and updates. It's that or the fact that last year I did a clean installation of Windows 10. Not that much of a fuss, and my system works like it should. I highly recommend that people do this at least once for their Windows 10 installation, especially if it's an upgrade. Unless they enjoy complaining about Microsoft's evil update scheme more than using their computer.
  • Same here
    All the problems I encountered with Windows 10 since release were minor ones.
  • I do think that the news cycle has shifted more towards covering update issues and Windows 10 bugs. I think it's still newsworthy, but I have to hedge the articles and point out that it might not affect everyone.
  • Yeah but this isn't a feature update that can be postponed, this is a regular Patch Tuesday update. That's a big deal - everyone gets those (and normally should welcome them).
  • same here as well, no big isssues to deal with, i always try get in some clean installs between these updgrades.
  • Not had this problem, nor the reported printer issues.
  • Same here. I have not had any issues with any update since 2015 when Windows 10 came to be. I think l am lucky here.
  • What happened? Not enough Insiders reported it?
  • Still waiting on the May update for my Surface Laptop 3 so I can get WSL2... Maybe I will get it before July. Or, maybe, before the ARM MacBooks are announced in the Fall and I am tempted to ditch Windows.
  • OK this one's really bad. No problems for me personally but Patch Tuesday should be Peaceful Tuesday, not Problem Tuesday.
  • Same here. I guess I've just been more fortunate that some. No issues with any of the problematic updates that have plagued Microsoft lately. However, I have to say, for a company that size, this many consecutive screw ups with the updates is totally unacceptable. Sure, you might have occasional issue, because, unlike Apple that only has to contend with a small handful of hardware variants (all of which they control), there's nearly an infinite number of possible hardware configurations Microsoft has to contend with. But, by that same token, there really should be nearly NO issues with Windows on any Surface devices. That's an even smaller handful to deal with than Apple has.
  • Agree with others. I've had no major problems with Win 10 updates on my < year old Surface Pro 7. I have run into a few issues, for example Outlook Desktop sometimes fails to start, which forces me to reset my PC to recover. But this is a rare event and overall my impression of Windows 10 is that it works well and for my use cases (Microsoft ecosystem, Android phone) is a better fit than the current Mac OS.
  • No problems here on a Surface Pro 4 or the gaming laptop I have. Given the billions of hardware combinations I would say that having the updates working flawlessly is a monumental task, especially as not everyone is in the Insider Program.