Windows Secure Boot Certificate Expired — Billions of PCs Affected Including Linux Distros

The clock has run out. As of June 24, 2026, the first of Microsoft’s original Secure Boot certificates, the Microsoft Corporation KEK CA 2011, has officially expired, with the Microsoft UEFI CA 2011 following on June 27, 2026. A third, the Microsoft Windows Production PCA 2011, is set to expire on October 19, 2026. Together, these...

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