---
title: "CVE-2015-7504\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-2015-7504?format=md
keywords: index, follow
---

# CVE-2015-7504

Publication date 30 November 2015

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2015-7504?format=md#impact-score)

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## Description

Heap-based buffer overflow in the pcnet\_receive function in hw/net/pcnet.c
in QEMU allows guest OS administrators to cause a denial of service
(instance crash) or possibly execute arbitrary code via a series of packets
in loopback mode.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| qemu | 15.10 wily | Fixed 1:2.3+dfsg-5ubuntu9.1 |
| 15.04 vivid | Fixed 1:2.2+dfsg-5expubuntu9.7 |
| 14.04 LTS trusty | Fixed 2.0.0+dfsg-2ubuntu1.21 |
| 12.04 LTS precise | Not in release |
| qemu-kvm | 15.10 wily | Not in release |
| 15.04 vivid | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Fixed 1.0+noroms-0ubuntu14.26 |
| xen | 15.10 wily | Not affected |
| 15.04 vivid | Not affected |
| 14.04 LTS trusty | Fixed 4.4.2-0ubuntu0.14.04.4 |
| 12.04 LTS precise | Fixed 4.1.6.1-0ubuntu0.12.04.8 |

---

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

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.8 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7504)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-7504)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-7504)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-7504)

### Related Ubuntu Security Notices (USN)

+ [USN-2828-1](https://usn.ubuntu.com/USN-2828-1)
+ QEMU vulnerabilities
+ 3 December 2015

### Other references

* <https://lists.gnu.org/archive/html/qemu-devel/2015-11/msg06342.html>
* <http://xenbits.xen.org/xsa/advisory-162.html>
* <https://www.cve.org/CVERecord?id=CVE-2015-7504>