CVE-2026-23098
Unknown Unknown - Not Provided

Double-Free Vulnerability in Linux Kernel netrom nr_route_frame

Publication date: 2026-02-04

Last updated on: 2026-04-03

Assigner: kernel.org

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.

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Meta Information

Published
2026-02-04
Last Modified
2026-04-03
Generated
2026-07-06
AI Q&A
2026-02-04
EPSS Evaluated
2026-07-05
NVD
CVE-2026-23098

Affected Vendors & Products

Showing 17 associated CPEs
Vendor Product Version / Range
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.11 (inc) to 5.15.199 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.162 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.122 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.68 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.8 (exc)
linux linux_kernel 6.19
linux linux_kernel From 2.6.12.1 (inc) to 5.10.249 (exc)

Helpful Resources

Exploitability

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CWE ID Description
CWE-415 The product calls free() twice on the same memory address.

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Executive Summary

This vulnerability exists in the Linux kernel's netrom component, specifically in the function nr_route_frame(). The issue is a double-free bug where a memory buffer (old_skb) is freed twice. This happens because the code frees old_skb without first checking if the pointer nr_neigh->ax25 is NULL. If nr_neigh->ax25 is NULL, the caller function will attempt to free old_skb again, leading to a double-free condition.

The fix involves modifying the code to check whether nr_neigh->ax25 is NULL before freeing old_skb, preventing the double-free from occurring.

Impact Analysis

A double-free vulnerability can lead to undefined behavior such as memory corruption, crashes, or potentially allow an attacker to execute arbitrary code. In this case, exploiting the double-free bug in the Linux kernel's netrom component could compromise system stability or security.

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