I assume we’re talking about the secure boot CA. From my search:
“If devices fail to receive the new CA entries, they risk losing the ability to accept future DB/DBX/boot manager updates and could drift into a degraded pre‑boot security posture over time. Microsoft and OEMs are deliberately staging updates to avoid mass disruption; many modern devices shipped since 2024 already include the 2023 certificates in firmware.”
But to answer your question, every source I’ve found says the machines will still boot.
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Something a little more authoritative: https://support.microsoft.com/en-us/topic/windows-secure-boot-certificate-expiration-and-ca-updates-7ff40d33-95dc-4c3c-8725-a9b95457578e
“Devices that haven’t received the newer 2023 certificates will continue to start and operate normally, and standard Windows updates will continue to install. However, these devices will no longer be able to receive new security protections for the early boot process, including updates to Windows Boot Manager, Secure Boot databases, revocation lists, or mitigations for newly discovered boot level vulnerabilities.”
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John Wright
IT Support Specialist
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1800 Old Bluegrass Avenue, Louisville, KY 40215
Please submit IT requests to Hazelwoo...@bluegrass.org
24 Hour Helpline 1.800.928.8000
CONFIDENTIALITY NOTICE: This message contains confidential information and is intended only for the individual(s) addressed in the message. If you are not the named addressee, you should not disseminate, distribute, or copy this e-mail. If you are not the intended recipient, you are notified that disclosing, distributing, or copying this e-mail is strictly prohibited.
To view this discussion visit https://groups.google.com/d/msgid/ntsysadmin/be953fb6-60dd-490a-98c2-5b92039c3137%40univie.ac.at.