CVE-2026-23098

netrom: fix double-free in nr_route_frame()

CVSS 8.8 HIGHEPSS 0.2%

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.8EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

04 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux · Linux

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