Windows PCs should no longer repeatedly restart or fail to install update with KB5091157

New OOB emergency updates are out to fix major issues that were being caused by the recent KB5082063, KB5082142 updates.

A few days ago we covered a Windows Server bug wherein systems were repeatedly restarting as a result of a compatibility conflict following the latest Patch Tuesday updates like KB5082063 and KB5082142.

This weekend, Microsoft has released multiple emergency out-of-band (OOB) updates for all supported versions of Windows Server. The company has fixed the problem as well as an installation bug. Microsoft writes:

"Microsoft has released out-of-band (OOB) updates today, April 19, 2026, to address issues introduced by the April 2026 Windows security update. ... A limited number of Windows Server 2025 devices might experience failures installing the April 2026 security update (KB5082063). In addition, some versions of Windows Server may experience domain controllers restarting repeatedly after installing the April 2026 security update. ... To address these issues, Microsoft has released OOB updates for the Windows Server versions"

As part of the improvements in the changelog, Microsoft writes:

"This out-of-band update contains quality improvements from KB5082063 (released April 14, 2026).

• [Domain controllers (known issue)] Fixed: After installing the April 14, 2026, Windows security update (KB5082063) and restarting, domain controllers with multi-domain forests that use Privileged Access Management (PAM), might experience startup issues. In some cases, Local Security Authority Subsystem Service (LSASS) might stop responding, leading to repeated restarts, and preventing authentication and directory services, which can make the domain unavailable.
• [Windows update installation] Fixed: A small number of Windows Server 2025 devices might fail to install the April 14, 2026, Windows security update (KB5082063). When this issue occurs, affected devices might display one of the following error messages: “Install error: 0x800F0983” or “Some update files are missing or have problems. We’ll try to download the update again later. Error code: 0x80073712.”"

The BitLocker recovery bug, though, still remains as a known issue. You can find the official support articles here on Microsoft's official website.

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Posted Monday 20 April 2026 at 5:39 pm AEST (my time).

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