Microsoft UEFI CA 2011 Expired June 27, Secure Boot Failures Possible

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The Microsoft UEFI Certification Authority from 2011 expired on June 27, 2026, potentially causing Secure Boot validation failures for third-party bootloaders, option ROMs, and older firmware blobs. Devices most at risk include self-hosted bare metal servers, edge appliances, IoT gateways, and hardware predating 2022 that have not received recent firmware updates. Major Linux distributions such as Debian, Ubuntu, and Fedora proactively issued dual-signed shim binaries ahead of the expiry, leaving most regularly updated systems unaffected. Users experiencing boot failures dated on or after June 27 are advised to update their hardware firmware and bootloader shims from their distribution's repositories. The shim-review team processed 21 reviews in a matter of weeks to help vendors and maintainers meet the deadline, though devices left untouched for years remain the primary concern.

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