---
title: "CVE-2019-20795\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-2019-20795?format=md
keywords: index, follow
---

# CVE-2019-20795

Publication date 9 May 2020

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**4.4 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-20795?format=md#impact-score)

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## Description

iproute2 before 5.1.0 has a use-after-free in get\_netnsid\_from\_name in
ip/ipnetns.c. NOTE: security relevance may be limited to certain uses of
setuid that, although not a default, are sometimes a configuration option
offered to end users. Even when setuid is used, other factors (such as C
library configuration) may block exploitability.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-20795?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| iproute2 | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 18.04 LTS bionic | Fixed 4.15.0-2ubuntu1.1 |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | 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)

## Notes

---

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

vulnerability introduced in v4.15.0

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

4.4 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 4.4 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20795)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-20795)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-20795)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-20795)

### Related Ubuntu Security Notices (USN)

+ [USN-4357-1](https://usn.ubuntu.com/USN-4357-1)
+ IPRoute vulnerability
+ 13 May 2020

### Other references

* <https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9bf2c538a0eb10d66e2365a655bf6c52f5ba3d10>
* <https://www.cve.org/CVERecord?id=CVE-2019-20795>