---
id: CVE-2026-72051
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink

  ip6_tnl_changelink() operates on at most two netns, dev_net(dev) and the
  tunnel link netns t-…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink

  ip6_tnl_changelink() operates on at most two netns, dev_net(dev) and the
  tunnel link netns t-…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
published: '2026-08-15'
updated: '2026-08-23'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72051'
references:
  - url: 'https://git.kernel.org/stable/c/234cd54fc500f69db43e37de38603da617fbbeea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2496fa0b7d180b3ad356b514e7ff93bb14e6140a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2636d061bc237a2446a146e42dcc6563acfa7432'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2d53ee7daabe733deb81f51d2cc90188f8ad59a1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5252db8fb604321133138c7069d6fc3fcd89cdee'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/82e53e7281c71e174f9f5877c566a623c637b406'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d4bcc202a3530c856e1cb183384bc9cc8fddab22'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00169
epssPercentile: 0.06588
ingestedAt: '2026-08-23T13:48:07.809Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink

ip6_tnl_changelink() operates on at most two netns, dev_net(dev) and the
tunnel link netns t->net. They differ once the device is created in or
moved to a netns other than the one the request runs in. The rtnl
changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a
caller privileged there but not in t->net can rewrite a tunnel that
lives in t->net.

Gate ip6_tnl_changelink() on rtnl_dev_link_net_capable() at its top,
before any attribute is parsed.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.