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CVE-2026-23098: netrom: fix double-free in nr_route_frame()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-04 · updated 2026-06-17
• Weakness: CWE-415

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.

Affected products

• Linux kernel: from 2.6.12.1 before 5.10.249; from 5.11 before 5.15.199; from 5.16 before 6.1.162; from 6.2 before 6.6.122; from 6.7 before 6.12.68; from 6.13 before 6.18.8 — fixed in 5.10.249, 5.15.199, 6.1.162, 6.12.68, 6.18.8, 6.6.122

How to fix

Upgrade to a fixed version: Linux kernel 5.10.249, 5.15.199, 6.1.162, 6.12.68. Check the vendor advisory for mitigations.

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/94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c
• https://git.kernel.org/stable/c/9f5fa78d9980fe75a69835521627ab7943cb3d67
• https://git.kernel.org/stable/c/ba1096c315283ee3292765f6aea4cca15816c4f7
• https://git.kernel.org/stable/c/bd8955337e3764f912f49b360e176d8aaecf7016

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