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Microsoft Confirms Windows Server Security Update Caused Memory Leak, 'Unscheduled' Reboots

"Microsoft confirmed that a memory leak introduced with the March 2024 Windows Server security updates is behind a widespread issue causing Windows domain controllers to crash," BleepingComputer reported Thursday. Friday Microsoft wrote that the issue "was resolved in the out-of-band update KB503...

But Microsoft confirmed it impacted all domain controller servers with the latest Windows Server 2012 R2, 2016, 2019, and 2022 updates: As BleepingComputer first reported on Wednesday and as many admins have warned over the last week, affected servers are freezing and restarting unexpectedly due to a Local Security Authority Subsystem Service (LSASS) process memory leak introduced with this month's cumulative updates. The leak "is observed when on-premises and cloud-based Active Directory Domain Controllers service Kerberos authentication requests," Microsoft wrote. "Extreme memory leaks may cause LSASS to crash, which triggers an unscheduled reboot of underlying domain controllers..."

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