CVE-2026-23098

netrom: fix double-free in nr_route_frame()

State: Published
Severity: 8.8 High
Published: Feb 4, 2026
Updated: Aug 5, 2026
Reserved: Jan 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 25aab6bfc31017a7e52035b99aef5c2b6bde8ffbAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6e0110ea90313b7c0558a0b77038274a6821caf8Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7c48fdf2d1349bb54815b56fb012b9d577707708Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bd8955337e3764f912f49b360e176d8aaecf7016Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8cAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9f5fa78d9980fe75a69835521627ab7943cb3d67Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ba1096c315283ee3292765f6aea4cca15816c4f7Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.249 through 5.10.Not affected 5.15.199 through 5.15.Not affected 6.1.162 through 6.1.Not affected 6.6.122 through 6.6.Not affected 6.12.68 through 6.12.Not affected 6.18.8 through 6.18.Not affected 6.19 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 25aab6bfc31017a7e52035b99aef5c2b6bde8ffbAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6e0110ea90313b7c0558a0b77038274a6821caf8Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7c48fdf2d1349bb54815b56fb012b9d577707708Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bd8955337e3764f912f49b360e176d8aaecf7016Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8cAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9f5fa78d9980fe75a69835521627ab7943cb3d67Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ba1096c315283ee3292765f6aea4cca15816c4f7Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.249 through 5.10.*Not affected
5.15.199 through 5.15.*Not affected
6.1.162 through 6.1.*Not affected
6.6.122 through 6.6.*Not affected
6.12.68 through 6.12.*Not affected
6.18.8 through 6.18.*Not affected
6.19 and laterNot affected

References

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