GHSA-Q3JR-W6WF-464W

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-23 15:32
VLAI
Details

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.

Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72051"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:14Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink\n\nip6_tnl_changelink() operates on at most two netns, dev_net(dev) and the\ntunnel link netns t-\u003enet. They differ once the device is created in or\nmoved to a netns other than the one the request runs in. The rtnl\nchangelink path checks CAP_NET_ADMIN only against dev_net(dev), so a\ncaller privileged there but not in t-\u003enet can rewrite a tunnel that\nlives in t-\u003enet.\n\nGate ip6_tnl_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed.",
  "id": "GHSA-q3jr-w6wf-464w",
  "modified": "2026-08-23T15:32:58Z",
  "published": "2026-08-15T06:32:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72051"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/234cd54fc500f69db43e37de38603da617fbbeea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2496fa0b7d180b3ad356b514e7ff93bb14e6140a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2636d061bc237a2446a146e42dcc6563acfa7432"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d53ee7daabe733deb81f51d2cc90188f8ad59a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5252db8fb604321133138c7069d6fc3fcd89cdee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82e53e7281c71e174f9f5877c566a623c637b406"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4bcc202a3530c856e1cb183384bc9cc8fddab22"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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