---
title: "CVE-2015-6823\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-2015-6823?format=md
keywords: index, follow
---

# CVE-2015-6823

Publication date 6 September 2015

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

The allocate\_buffers function in libavcodec/alac.c in FFmpeg before 2.7.2
does not initialize certain context data, which allows remote attackers to
cause a denial of service (segmentation violation) or possibly have
unspecified other impact via crafted Apple Lossless Audio Codec (ALAC)
data.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2015-6823?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| 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 |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not in release |
| 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 |
| 14.04 LTS trusty | Ignored |
| 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-2015-6823?format=md#patch-details)

## Notes

---

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

libav in precise doesn't look vulnerable

---

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

as of 2018-09-27, no equivalent fix in libav

### 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=f7068bf277a37479aecde2832208d820682b35e6> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6823)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-6823)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-6823)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-6823)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2015-6823>