---
id: CVE-2026-72055
title: 'net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink

  vti6_changelink() operates on at most two netns, dev_net(dev) and the
  tunnel link netns t->net. …
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    f5254e7766b4ac02b66b2ccef896cd278503cb11
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    ef897249dc957089e6f7f11ceea699e093ad51bd
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    c64b9ae7eb97e81d54b792910a3aeafd92566c79
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    0b2f9c908f930ec4be17d389723f9a202d6a883c
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    f97e93ebf2f9b8ef3b87f7a9371255e84d151587
  - >-
    Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 <
    e2ac3b242c37dff323a964962e43854f4b1a2b79
  - Linux 3.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:51:02.327568Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:53:18.538Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72055'
references:
  - url: 'https://git.kernel.org/stable/c/f5254e7766b4ac02b66b2ccef896cd278503cb11'
  - url: 'https://git.kernel.org/stable/c/ef897249dc957089e6f7f11ceea699e093ad51bd'
  - url: 'https://git.kernel.org/stable/c/f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba'
  - url: 'https://git.kernel.org/stable/c/c64b9ae7eb97e81d54b792910a3aeafd92566c79'
  - url: 'https://git.kernel.org/stable/c/b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf'
  - url: 'https://git.kernel.org/stable/c/0b2f9c908f930ec4be17d389723f9a202d6a883c'
  - url: 'https://git.kernel.org/stable/c/f97e93ebf2f9b8ef3b87f7a9371255e84d151587'
  - url: 'https://git.kernel.org/stable/c/e2ac3b242c37dff323a964962e43854f4b1a2b79'
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.05784
ingestedAt: '2026-10-16T17:24:46.874Z'
---

## Overview

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

net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink

vti6_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 vti6_changelink() on rtnl_dev_link_net_capable() at its top,
before any attribute is parsed.

## Affected

- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < f5254e7766b4ac02b66b2ccef896cd278503cb11`
- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < ef897249dc957089e6f7f11ceea699e093ad51bd`
- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba`
- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < c64b9ae7eb97e81d54b792910a3aeafd92566c79`
- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf`
- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < 0b2f9c908f930ec4be17d389723f9a202d6a883c`
- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < f97e93ebf2f9b8ef3b87f7a9371255e84d151587`
- `Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < e2ac3b242c37dff323a964962e43854f4b1a2b79`
- `Linux 3.15`

## Remediation

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