AMD SEV firmware: Missing authentication in SEV-TIO guest request handling
Summary
AMD Secure Encrypted Virtualization (SEV) firmware on certain EPYC 9005, EPYC 8005 and EPYC Embedded 9005 processors does not authenticate critical SEV-TIO guest request messages. A malicious hypervisor could forge these messages and potentially compromise the integrity and confidentiality of SEV-SNP guest memory. The attack requires local access with high privileges on the host.
Affected
- AMD EPYC 9005 Series Processors (default: affected)
- AMD EPYC 8005 Series Processors (default: affected)
- AMD EPYC Embedded 9005 Series Processors (default: affected)
- Version data unclear: the CVE record lists a single unaffected entry (TurinPI_1.0.0.B; EmbeddedTurinPI_SP5_1005 for Embedded 9005)
Fixed in
Unknown. Check AMD-SB-3038 and your server vendor for the fixed firmware/BIOS build.
Workaround
Unknown.
Exploitation
- Not known to be exploited in the wild (OffSeq)
- Not listed in CISA KEV according to The Hacker Wire; the CISA catalog itself was not checked
- No public proof-of-concept known
Our recommendation
- Confirm whether any server uses EPYC 9005, 8005 or Embedded 9005 processors and whether SEV/SEV-SNP is enabled
- Ask your server or hosting provider which BIOS/firmware build addresses AMD-SB-3038 and apply it in the normal maintenance cycle
- Plan one firmware update covering the whole bulletin, as it includes 12 SEV CVEs
- Restrict administrative access to the hypervisor
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- AMD Security Bulletin AMD-SB-3038 www.amd.com
- CVE Record CVE-2026-0480 www.cve.org
- AMD Product Security www.amd.com
- Supermicro Security Center www.supermicro.com
- OffSeq Radar CVE-2026-0480 radar.offseq.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 14:43.
Original description (NVD)
Missing Authentication for Critical Function in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to forge SEV-TIO guest request messages potentially compromising SEV-SNP guest memory integrity and confidentiality.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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