CVE-2026-72054
Published: August 18, 2026Last modified: August 18, 2026
Description
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | CHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.182-r0) |
| 25 LTS | linux-lts | Fixed (6.12.103-r0) | |
| Stream | linux-lts | Fixed (6.18.43-r0) |
References
- https://git.kernel.org/stable/c/1caf737e625143c6f23c32d2b747b1a3e42e5699
- https://git.kernel.org/stable/c/32edf8aa297745226854eda2d96c0fac66c1bb15
- https://git.kernel.org/stable/c/33fd93961557ec8e3e9958995b28684c5f949394
- https://git.kernel.org/stable/c/6d8bc0dc99472d62c57c2a3d436e6ab408592bda
- https://git.kernel.org/stable/c/88b33ee458a6ca5fbef6c53b9dba772da69dab68
- https://git.kernel.org/stable/c/9571af2eec8023af9a1671b7f2cd4ab400011724
- https://git.kernel.org/stable/c/95cceadbfd52d7239bd730afdda0655287d77425
- https://git.kernel.org/stable/c/973ead9e565423642e4533e1547b5d2c0476fb03