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what is the out of band patch and kb number to fix April 2026 patch Tuesday issue of domain controller reboot?

Nawab Jan Shaikh 0 Reputation points
2026-05-05T13:45:32.7833333+00:00

what is the out of band patch and kb number to fix April 2026 patch Tuesday issue of domain controller reboot?

Windows for business | Windows Server | Directory services | Active Directory
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  1. Harry Phan 21,825 Reputation points Independent Advisor
    2026-05-05T13:54:00.1966667+00:00

    Hi Nawab,

    Microsoft confirmed that the April 2026 Patch Tuesday updates caused domain controllers to hit reboot loops due to LSASS crashes. The fix was released as an out‑of‑band update on April 19, 2026. For Windows Server 2025 domain controllers, the patch you need is KB5091157. This cumulative update includes the original April security fixes but resolves the reboot issue.

    If the above response helps answer your question, please hit "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

    Harry.

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  2. AI answer

    2026-05-05T13:45:43.9766667+00:00

    For the April 2026 Patch Tuesday issue where domain controllers repeatedly reboot after installing the April 2026 security updates, the out-of-band (OOB) fixes are:

    • Windows Server 2025 domain controllers:
      • Standard OOB update: KB5091157
      • If enrolled in Hotpatch: KB5091470
    • Windows Server 2022 domain controllers:
      • Standard OOB update: KB5091575
      • If enrolled in Hotpatch: KB5091576
    • Windows Server 2016 (and other affected versions listed under that track):
      • Standard OOB update: KB5091572

    These OOB updates resolve the LSASS crash and repeated restart issue on domain controllers after the April 2026 security updates.

    References:

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