CVE-2026-72061

In 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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.0 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://git.kernel.org/stable/c/27ccb68e7cccead5d8c611665a45d23032d468b3
https://git.kernel.org/stable/c/3118e97dae533fb45964b87bbed1801afcff7c65
https://git.kernel.org/stable/c/388ccffbd2e7e5e4271f291085a7451865705305
https://git.kernel.org/stable/c/7d139dec96691cde96cb40ed293e2d13d994fb4f
https://git.kernel.org/stable/c/99ae3248b33df94201915d9c32e7470cdf08cfcd
https://git.kernel.org/stable/c/c0ea1aedb37bb979e864ed7787975434bbd9db73
https://git.kernel.org/stable/c/c5a0ae895432596b2f464172da8218e2d84e2932
https://git.kernel.org/stable/c/cb41b308e9d867725d965b291dd085028e36a480

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:21

Updated : 2026-08-17 06:18

NVD link : CVE-2026-72061

Mitre link : CVE-2026-72061

CVE.ORG link : CVE-2026-72061

JSON object : View

Products Affected

No product.

CWE

No CWE.

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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->net can rewrite a tunnel that\nlives in t->net.\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."}], "lastModified": "2026-08-17T06:18:04.467", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}