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

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ip_vti: require CAP_NET_ADMIN in the device netns for changelink vti_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 vti_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.

Timeline

1. Aug 15, 2026, 5:52 AM UTCCVE published
2. Oct 16, 2026, 3:50 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 9:19 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 1caf737e625143c6f23c32d2b747b1a3e42e5699; From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 32edf8aa297745226854eda2d96c0fac66c1bb15; From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 973ead9e565423642e4533e1547b5d2c0476fb03; From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 33fd93961557ec8e3e9958995b28684c5f949394; From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 6d8bc0dc99472d62c57c2a3d436e6ab408592bda; From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 9571af2eec8023af9a1671b7f2cd4ab400011724; From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 88b33ee458a6ca5fbef6c53b9dba772da69dab68; From 895de9a3488abcdd186680f0af3cce7f2d4d4a6e · fixed in 95cceadbfd52d7239bd730afdda0655287d77425

• Linux Linux

  3.15

• KernelLinux

  From 3.15.0 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8