---
title: "CVE-2015-6855\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-2015-6855?format=md
keywords: index, follow
---

# CVE-2015-6855

Publication date 11 September 2015

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2015-6855?format=md#impact-score)

Toggle side navigation

## Description

hw/ide/core.c in QEMU does not properly restrict the commands accepted by
an ATAPI device, which allows guest users to cause a denial of service or
possibly have unspecified other impact via certain IDE commands, as
demonstrated by a WIN\_READ\_NATIVE\_MAX command to an empty drive, which
triggers a divide-by-zero error and instance crash.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| qemu | 15.04 vivid | Fixed 1:2.2+dfsg-5expubuntu9.5 |
| 14.04 LTS trusty | Fixed 2.0.0+dfsg-2ubuntu1.19 |
| 12.04 LTS precise | Not in release |
| qemu-kvm | 15.04 vivid | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Fixed 1.0+noroms-0ubuntu14.25 |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2015-6855?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| qemu | * Upstream:   <http://git.qemu.org/?p=qemu.git;a=commit;h=d9033e1d3aa666c5071580617a57bd853c5d794a> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6855)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-6855)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-6855)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-6855)

### Related Ubuntu Security Notices (USN)

+ [USN-2745-1](https://usn.ubuntu.com/USN-2745-1)
+ QEMU vulnerabilities
+ 24 September 2015

### Other references

* <http://www.openwall.com/lists/oss-security/2015/09/10/1>
* <https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg02479.html>
* <https://www.cve.org/CVERecord?id=CVE-2015-6855>