AMD patches high severity security flaw affecting Zen chips

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Chipmaking giantAMDhas confirmed it recently patched a high-severity vulnerability affecting its Zen 1 to Zen 4 CPUs.

As a result, the confidentiality and integrity of a confidential guest running under AMD SEV-SNP would be lost.

Additionally, an SEV firmware update is required for some platforms to support SEV-SNP attestation.

Updating the system BIOS image and rebooting the platform will enable attestation of the mitigation.

A confidential guest can verify the mitigation has been enabled on the target platform through the SEV-SNP attestation report.

The company only publicly disclosed the flaw recently, but the patch was actually released in mid-December 2024.

AMD decided to delay the announcement to give its customers enough time to mitigate the problem.