Windows 10 LSASS security feature crashes for some users

Don Sharpe
by Don Sharpe
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  • Users reported a Patch Tuesday update-linked LSASS bug forcing them to restart their machines on login.
  • Microsoft said its working to resolve the issue.
  • Our Windows 10 Updates section offers tips and guides to fixing OS update issues. Be sure to check it out when your Patch Tuesday fixes don't work as anticipated!
  • Don't forget to visit the Patch Tuesday page to get the latest patches for Windows 10 security bugs.
Patch Tuesday-linked LSASS failure

Patch Tuesday updates, which come only once a month, typically address multiple Windows 10 security issues. The latest such updates arrived on June 9, 2020, and delivered 139 CVE fixes.

But they also left a trail of OS and app bugs, some of which affect Windows 10 users to date.

Lately, some users have been complaining about their PCs crashing on login after installing some of the June 9, 2020 updates. Microsoft has acknowledged the issue, which it attributes to the failure of the Local Security Authority Subsystem Service (LSASS) file.

The Windows 10 LSASS problem

LSASS is responsible for enforcing Windows 10 security policy. The service verifies your credentials when you try logging into Windows, and it also handles password changes.

Considering lsass.exe is vital to the Windows 10 sign-in process, it’s going to interfere with access to your PC if it crashes. That’s the nightmare some users are facing after installing certain Patch Tuesday updates.

They have to reboot their PCs as a result.

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 has linked the bug to at least four different updates, namely:

KB4557957: This one has had other issues before, including freezing your PC.

kb4560960: It too had a couple of issues, including a now-resolved printing bug.

kb4567512: Microsoft released this optional update on June 16, 2020 to fix a printing issue. Well, the update is now associated with the LSASS bug.

KB4567523: Also a non-security update released to fix the printer problem.

It’s a shame that there’s no ready workaround for the LSASS issue forcing users to reboot their PCs. Microsoft though said it’s developing a fix that should come out in a future update.

Has the lsass.exe bug affected you yet? Kindly lets us know or ask any question via the comments section below.