Fabricked: Misconfiguring Infinity Fabric to Break AMD SEV-SNP

7 hours ago

Fabricked is a software-based attack that manipulates memory routing in AMD SEV-SNP by misconfiguring the Infinity Fabric.
A malicious hypervisor can bypass SEV-SNP initialization, leading to an uninitialized RMP and allowing arbitrary read/write access to Confidential VM memory.
The attack is deterministic with 100% success probability, requiring only hypervisor and UEFI privileges, and affects AMD Zen 3, Zen 4, and Zen 5 processors.
AMD acknowledged the vulnerability (CVE-2025-54510) and released patches, while noting it does not affect non-confidential VMs or other SEV versions.

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