GHSA-56J6-32RP-JFRG
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
net: sit: require CAP_NET_ADMIN in the device netns for changelink
ipip6_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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed. sit was the one tunnel type not covered by the recent series that added this check to the other changelink() handlers.
{
"affected": [],
"aliases": [
"CVE-2026-72061"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:21:15Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sit: require CAP_NET_ADMIN in the device netns for changelink\n\nipip6_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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed. sit was the one tunnel type not covered\nby the recent series that added this check to the other changelink()\nhandlers.",
"id": "GHSA-56j6-32rp-jfrg",
"modified": "2026-08-17T06:33:07Z",
"published": "2026-08-15T06:32:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72061"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/27ccb68e7cccead5d8c611665a45d23032d468b3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3118e97dae533fb45964b87bbed1801afcff7c65"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/388ccffbd2e7e5e4271f291085a7451865705305"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7d139dec96691cde96cb40ed293e2d13d994fb4f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/99ae3248b33df94201915d9c32e7470cdf08cfcd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c0ea1aedb37bb979e864ed7787975434bbd9db73"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c5a0ae895432596b2f464172da8218e2d84e2932"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cb41b308e9d867725d965b291dd085028e36a480"
}
],
"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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