CVE-2026-72051

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.

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/234cd54fc500f69db43e37de38603da617fbbeea
https://git.kernel.org/stable/c/2496fa0b7d180b3ad356b514e7ff93bb14e6140a
https://git.kernel.org/stable/c/2636d061bc237a2446a146e42dcc6563acfa7432
https://git.kernel.org/stable/c/2d53ee7daabe733deb81f51d2cc90188f8ad59a1
https://git.kernel.org/stable/c/5252db8fb604321133138c7069d6fc3fcd89cdee
https://git.kernel.org/stable/c/7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa
https://git.kernel.org/stable/c/82e53e7281c71e174f9f5877c566a623c637b406
https://git.kernel.org/stable/c/d4bcc202a3530c856e1cb183384bc9cc8fddab22

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:21

Updated : 2026-08-23 13:16

NVD link : CVE-2026-72051

Mitre link : CVE-2026-72051

CVE.ORG link : CVE-2026-72051

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 ip6_tnl_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."}], "lastModified": "2026-08-23T13:16:38.300", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}