---
id: CVE-2019-20795
title: >-
  iproute2 before 5.1.0 has a use-after-free in get_netnsid_from_name in
  ip/ipnetns.c
summary: >-
  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 user…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-416
vendor: iproute2_project
product: iproute2
affected:
  - iproute2 < 5.1.0
  - ubuntu_linux = 18.04
patched:
  - iproute2 5.1.0
published: '2020-05-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T08:17:01.427'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-20795'
references:
  - url: 'https://bugzilla.suse.com/show_bug.cgi?id=1171452'
    label: cve@mitre.org
  - url: >-
      https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9bf2c538a0eb10d66e2365a655bf6c52f5ba3d10
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/202008-06'
    label: cve@mitre.org
  - url: 'https://usn.ubuntu.com/4357-1/'
    label: cve@mitre.org
  - url: 'https://bugzilla.suse.com/show_bug.cgi?id=1171452'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9bf2c538a0eb10d66e2365a655bf6c52f5ba3d10
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202008-06'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://usn.ubuntu.com/4357-1/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-20795.json
  - url: 'https://access.redhat.com/security/cve/CVE-2019-20795'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1868211'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2019-20795'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2019-20795'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00403
epssPercentile: 0.3435
ingestedAt: '2026-10-14T08:23:04.330Z'
---

## Overview

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.

## Affected

- `iproute2 < 5.1.0`
- `ubuntu_linux = 18.04`

## Remediation

Upgrade past the affected range:

- `iproute2 5.1.0`

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-20795.json)