---
title: "CVE-2014-7933\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-2014-7933?format=md
keywords: index, follow
---

# CVE-2014-7933

Publication date 22 January 2015

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

Use-after-free vulnerability in the matroska\_read\_seek function in
libavformat/matroskadec.c in FFmpeg before 2.5.1, as used in Google Chrome
before 40.0.2214.91, allows remote attackers to cause a denial of service
or possibly have unspecified other impact via a crafted Matroska file that
triggers improper maintenance of tracks data.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| chromium-browser | 18.04 LTS bionic | Fixed 40.0.2214.94-0ubuntu1.1120 |
| 17.10 artful | Fixed 40.0.2214.94-0ubuntu1.1120 |
| 17.04 zesty | Fixed 40.0.2214.94-0ubuntu1.1120 |
| 16.10 yakkety | Fixed 40.0.2214.94-0ubuntu1.1120 |
| 16.04 LTS xenial | Fixed 40.0.2214.94-0ubuntu1.1120 |
| 15.10 wily | Fixed 40.0.2214.94-0ubuntu1.1120 |
| 15.04 vivid | Fixed 40.0.2214.94-0ubuntu1.1120 |
| 14.10 utopic | Fixed 40.0.2214.94-0ubuntu0.14.10.1.1110 |
| 14.04 LTS trusty | Fixed 40.0.2214.94-0ubuntu0.14.04.1.1068 |
| 12.04 LTS precise | Ignored |
| 10.04 LTS lucid | Ignored end of life |
| ffmpeg | 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Not affected |
| 15.04 vivid | Not affected |
| 14.10 utopic | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not in release |
| 10.04 LTS lucid | Ignored end of life |
| libav | 18.04 LTS bionic | Not in release |
| 17.10 artful | Not in release |
| 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 15.10 wily | Not in release |
| 15.04 vivid | Ignored end of life |
| 14.10 utopic | Ignored end of life |
| 14.04 LTS trusty | Fixed 6:9.20-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 4:0.8.17-0ubuntu0.12.04.1 |
| 10.04 LTS lucid | Not in release |
| mplayer | 18.04 LTS bionic | Not affected |
| 17.10 artful | Ignored end of life |
| 17.04 zesty | Ignored end of life |
| 16.10 yakkety | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Not in release |
| 15.04 vivid | Not in release |
| 14.10 utopic | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Ignored end of life |
| 10.04 LTS lucid | Ignored end of life |
| oxide-qt | 18.04 LTS bionic | Not in release |
| 17.10 artful | Fixed 1.4.2-0ubuntu1 |
| 17.04 zesty | Fixed 1.4.2-0ubuntu1 |
| 16.10 yakkety | Fixed 1.4.2-0ubuntu1 |
| 16.04 LTS xenial | Fixed 1.4.2-0ubuntu1 |
| 15.10 wily | Fixed 1.4.2-0ubuntu1 |
| 15.04 vivid | Fixed 1.4.2-0ubuntu1 |
| 14.10 utopic | Fixed 1.4.2-0ubuntu0.14.10.1 |
| 14.04 LTS trusty | Fixed 1.4.2-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Not in release |
| 10.04 LTS lucid | 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)
* [Patch details](https://ubuntu.com/security/CVE-2014-7933?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 |
| --- | --- |
| ffmpeg | * Upstream:   <http://git.videolan.org/?p=ffmpeg.git;a=commit;h=490a3ebf36821b81f73e34ad3f554cb523dd2682> |
| libav | * Upstream:   <https://git.libav.org/?p=libav.git;a=commit;h=490a3ebf36821b81f73e34ad3f554cb523dd2682> * Upstream:   <https://git.libav.org/?p=libav.git;a=commit;h=51dd54c51aaca909893c9f90a4119e96ff71ffdf> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7933)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2014-7933)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2014-7933)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2014-7933)

### Related Ubuntu Security Notices (USN)

+ [USN-2476-1](https://usn.ubuntu.com/USN-2476-1)
+ Oxide vulnerabilities
+ 26 January 2015

### Other references

* <https://code.google.com/p/chromium/issues/detail?id=427266>
* <http://googlechromereleases.blogspot.com/2015/01/stable-update.html>
* <https://www.cve.org/CVERecord?id=CVE-2014-7933>