Quick answers
- Is CVE-2025-29940 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-29940 being exploited in the wild.
- How severe is CVE-2025-29940?
- Informational severity, published 10 November 2026.
- Which products and versions are affected?
- AMD Secure Encrypted Virtualization firmware.
- Is there a fix for CVE-2025-29940?
- 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-2025-29940 attacked?
- It is attacked with local access, in device firmware.
- Am I affected by CVE-2025-29940?
- Check whether you run Amd Secure Encrypted Virtualization 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
The vulnerability is an insufficient ownership verification in SEV firmware when the Reverse Map Table (RMP) segmentation is enabled. An attacker with hypervisor-level privileges can exploit this to overwrite guest virtual machine memory, bypassing the isolation guarantees that SEV is designed to provide. The attack requires elevated hypervisor access and affects guest data integrity when RMP is configured.
Affected products
- AMD Secure Encrypted Virtualization firmware
Timeline
- 2026-11-10: disclosed