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Windows 10 1607 Windows 10 1607 Out-of-band update
Out-of-band

KB5037423

KB5037423: Cumulative update for Windows 10, version 1607, March 2024. LSASS memory leak could trigger unexpected domain controller restarts

In short

Addresses an LSASS memory leak on domain controllers. If the leak becomes substantial, LSASS might stop responding and the controllers might restart unexpectedly.

Does it affect you? Applies to: Devices running Windows 10 version 1607, including Windows 10 Enterprise LTSB 2016. The issue concerns domain controllers processing Kerberos authentication requests.

Build
14393.6800
Restart
Required

Microsoft publishes separate notes for this KB for Windows Server.

What changes

Fix 1 change

Local Security Authority Subsystem Service (LSASS)

  • Addresses an LSASS memory leak on domain controllers. If the leak becomes substantial, LSASS might stop responding and the controllers might restart unexpectedly.1
    The issue occurs after installing KB5035855 and involves on-premises and cloud-based Active Directory domain controllers processing Kerberos authentication requests.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2024-03-22
Classification
Updates
Type
Cumulative update
Restart
Required
Replaced by
KB5046612
VersionBuildChannel
1607 14393.6800 General availability

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (1)
  1. 1. This substantial leak might cause excessive memory usage. Because of this, LSASS might stop responding, and the DCs will restart when you do not expect it. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 1 quoted passage · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake