LSASS crash triggers reboot loops on Windows domain controllers post-April 2026 updates
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Microsoft has confirmed that non-Global Catalog Windows domain controllers running April 2026 security updates (KB5082063) are entering reboot loops due to Local Security Authority Subsystem Service (LSASS) crashes during startup. The issue affects environments using Privileged Access Management (PAM) and disrupts authentication and directory services, potentially rendering domains unavailable. Affected platforms include Windows Server 2025, 2022, 23H2, 2019, and 2016. Microsoft is investigating and recommends contacting Support for Business for mitigation measures.
Timeline
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17.04.2026 10:59 1 articles · 23h ago
April 2026 security updates trigger LSASS crashes and reboot loops on Windows domain controllers
Non-Global Catalog Windows domain controllers running April 2026 security updates (KB5082063) experience Local Security Authority Subsystem Service (LSASS) crashes during startup, leading to reboot loops. The issue disrupts authentication and directory services in Privileged Access Management (PAM) environments and affects Windows Server 2025, 2022, 23H2, 2019, and 2016. Microsoft has not yet released a fix and recommends contacting Support for Business for mitigation steps.
Show sources
- Microsoft: Some Windows servers enter reboot loops after April patches — www.bleepingcomputer.com — 17.04.2026 10:59
Information Snippets
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Non-Global Catalog (non-GC) Windows domain controllers crash LSASS during startup after installing KB5082063 (April 2026 updates), triggering reboot loops.
First reported: 17.04.2026 10:591 source, 1 articleShow sources
- Microsoft: Some Windows servers enter reboot loops after April patches — www.bleepingcomputer.com — 17.04.2026 10:59
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The issue specifically impacts environments using Privileged Access Management (PAM), disrupting authentication and directory services.
First reported: 17.04.2026 10:591 source, 1 articleShow sources
- Microsoft: Some Windows servers enter reboot loops after April patches — www.bleepingcomputer.com — 17.04.2026 10:59
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Affected platforms include Windows Server 2025, Windows Server 2022, Windows Server 23H2, Windows Server 2019, and Windows Server 2016.
First reported: 17.04.2026 10:591 source, 1 articleShow sources
- Microsoft: Some Windows servers enter reboot loops after April patches — www.bleepingcomputer.com — 17.04.2026 10:59
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Microsoft is still investigating and has not yet released a patch; administrators are advised to contact Microsoft Support for Business for mitigation steps.
First reported: 17.04.2026 10:591 source, 1 articleShow sources
- Microsoft: Some Windows servers enter reboot loops after April patches — www.bleepingcomputer.com — 17.04.2026 10:59