---
title: "CVE-2016-7466\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-2016-7466?format=md
keywords: index, follow
---

# CVE-2016-7466

Publication date 21 September 2016

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**6.0 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-7466?format=md#impact-score)

Toggle side navigation

## Description

Memory leak in the usb\_xhci\_exit function in hw/usb/hcd-xhci.c in QEMU (aka
Quick Emulator), when the xhci uses msix, allows local guest OS
administrators to cause a denial of service (memory consumption and
possibly QEMU process crash) by repeatedly unplugging a USB device.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| qemu | 16.10 yakkety | Fixed 1:2.6.1+dfsg-0ubuntu5.1 |
| 16.04 LTS xenial | Fixed 1:2.5+dfsg-5ubuntu10.6 |
| 14.04 LTS trusty | Not affected |
| 12.04 LTS precise | Not in release |
| qemu-kvm | 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not affected |

---

* [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-2016-7466?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=b53dd4495ced2432a0b652ea895e651d07336f7e> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.0 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.0 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7466)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-7466)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-7466)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-7466)

### Related Ubuntu Security Notices (USN)

+ [USN-3125-1](https://usn.ubuntu.com/USN-3125-1)
+ QEMU vulnerabilities
+ 9 November 2016

### Other references

* <https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg02773.html>
* <http://www.openwall.com/lists/oss-security/2016/09/19/8>
* <https://www.cve.org/CVERecord?id=CVE-2016-7466>