---
title: "CVE-2017-8284\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-2017-8284?format=md
keywords: index, follow
---

# CVE-2017-8284

Publication date 26 April 2017

Last updated 4 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.0 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-8284?format=md#impact-score)

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## Description

The disas\_insn function in target/i386/translate.c in QEMU before 2.9.0,
when TCG mode without hardware acceleration is used, does not limit the
instruction size, which allows local users to gain privileges by creating a
modified basic block that injects code into a setuid program, as
demonstrated by procmail. NOTE: the vendor has stated "this bug does not
violate any security guarantees QEMU makes.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-8284?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| qemu | 17.04 zesty | Ignored |
| 16.10 yakkety | Ignored |
| 16.04 LTS xenial | Ignored |
| 14.04 LTS trusty | Ignored |
| 12.04 LTS precise | Not in release |
| qemu-kvm | 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Ignored |

---

* [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-2017-8284?format=md#patch-details)

## Notes

---

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

upstream disputed this has a security impact. Ignoring.

### 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=30663fd26c0307e414622c7a8607fbc04f92ec14> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.0 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.0 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8284)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-8284)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-8284)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-8284)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2017-8284>