---
title: "CVE-2012-3494\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2012-3494?format=md
keywords: index, follow
---

# CVE-2012-3494

Publication date 23 November 2012

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

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## Description

The set\_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1,
and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64
systems, allows local OS guest users to cause a denial of service (host
crash) by writing to the reserved bits of the DR7 debug control register.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2012-3494?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| xen | 13.10 saucy | Not affected |
| 13.04 raring | Not affected |
| 12.10 quantal | Not affected |
| 12.04 LTS precise | Fixed 4.1.2-2ubuntu2.4 |
| 11.10 oneiric | Fixed 4.1.1-2ubuntu4.4 |
| 11.04 natty | Not in release |
| 10.04 LTS lucid | Not in release |
| 8.04 LTS hardy | Not in release |
| xen-3.1 | 13.10 saucy | Not in release |
| 13.04 raring | Not in release |
| 12.10 quantal | Not in release |
| 12.04 LTS precise | Not in release |
| 11.10 oneiric | Not in release |
| 11.04 natty | Not in release |
| 10.04 LTS lucid | Not in release |
| 8.04 LTS hardy | Ignored end of life |
| xen-3.2 | 13.10 saucy | Not in release |
| 13.04 raring | Not in release |
| 12.10 quantal | Not in release |
| 12.04 LTS precise | Not in release |
| 11.10 oneiric | Not in release |
| 11.04 natty | Not in release |
| 10.04 LTS lucid | Not in release |
| 8.04 LTS hardy | Ignored end of life |
| xen-3.3 | 13.10 saucy | Not in release |
| 13.04 raring | Not in release |
| 12.10 quantal | Not in release |
| 12.04 LTS precise | Not in release |
| 11.10 oneiric | Not in release |
| 11.04 natty | Ignored end of life |
| 10.04 LTS lucid | Ignored end of life |
| 8.04 LTS hardy | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

This is XSA-12

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-3494)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2012-3494)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2012-3494)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2012-3494)

### Other references

* <http://seclists.org/oss-sec/2012/q3/376>
* <https://www.cve.org/CVERecord?id=CVE-2012-3494>