Quick answers
- Is CVE-2026-40669 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-40669 being exploited in the wild.
- How severe is CVE-2026-40669?
- Informational severity, published 10 November 2026.
- Which products and versions are affected?
- AMD Secure Encrypted Virtualization (SEV) firmware.
- Is there a fix for CVE-2026-40669?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-40669 attacked?
- It is attacked from the adjacent network, in device firmware.
- Am I affected by CVE-2026-40669?
- Check whether you run Amd Secure Encrypted Virtualization (SEV) firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An off-by-one error in the SEV firmware's Reverse Map Table (RMP) handling allows an attacker with hypervisor-level access to trigger memory corruption in the RMP structure. This vulnerability requires prior compromise of the hypervisor and direct access to SEV firmware interfaces. Exploitation could result in loss of guest memory integrity protections in virtualized environments.
Affected products
- AMD Secure Encrypted Virtualization (SEV) firmware
Timeline
- 2026-11-10: disclosed