CVE-2026-40668
AMD SEV Authentication Bypass
Description
Authentication bypass by spoofing in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to request attestation reports for VMPL 0.
INFO
Published Date :
Nov. 10, 2026, 10:11 p.m.
Last Modified :
Nov. 10, 2026, 10:11 p.m.
Remotely Exploit :
No
Source :
AMD
Affected Products
The following products are affected by CVE-2026-40668
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | b58fc414-a1e4-4f92-9d70-1add41838648 |
Solution
- Update AMD SEV firmware to the latest version.
- Verify attestation report access controls.
- Restrict hypervisor privileges where possible.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40668 vulnerability anywhere in the article.