CVE-2026-40669 · Infrastructure
NO FIX YET
An off-by-one error in AMD Secure Encrypted Virtualization firmware lets an attacker who already has hypervisor access corrupt the Reverse Map Table. The result is loss of guest memory integrity for virtual machines running on affected AMD hardware.
first public Nov 10, 2026 · 1 source
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Relevant to operators running confidential virtual machines on AMD EPYC hosts with SEV enabled. The attacker must already have hypervisor access, so hosts without SEV, or without untrusted hypervisor-level access, are unlikely to be exposed. The sources do not list affected firmware versions.
Not affected if no-sev-enabled, non-amd-hardware
Who cares amd, confidential-computing, hypervisor, sev
Unknown from the sources.
No fix yet, per the sources.
An off-by-one error in AMD Secure Encrypted Virtualization (SEV) firmware could allow an attacker with hypervisor access to corrupt the Reverse Map Table (RMP) table, potentially resulting in loss of guest memory integrity.
This page as .md · .json · CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
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