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Vulnerability record · CVE-2026-23098 · published 4 February 2026

CVE-2026-23098: Linux kernel double free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6% CWE-415 · Double free
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/25aab6bfc31017a7e52035b99aef5c2b6bde8ffb Patch
https://git.kernel.org/stable/c/6e0110ea90313b7c0558a0b77038274a6821caf8 Patch
https://git.kernel.org/stable/c/7c48fdf2d1349bb54815b56fb012b9d577707708 Patch
https://git.kernel.org/stable/c/94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c Patch
https://git.kernel.org/stable/c/9f5fa78d9980fe75a69835521627ab7943cb3d67 Patch
https://git.kernel.org/stable/c/ba1096c315283ee3292765f6aea4cca15816c4f7 Patch
https://git.kernel.org/stable/c/bd8955337e3764f912f49b360e176d8aaecf7016 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23098), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.