Werk #18345: net-snmp: Prevent segfault due to null pointer

Component

Checks & agents

Title

net-snmp: Prevent segfault due to null pointer

Date

Nov 11, 2025

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b1	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p16	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Under certain conditions, a function in the net-snmp library could return a null pointer instead of a valid one.

When such a null pointer was accessed a segmentation fault occurred. This caused Checkmk helper processes to crash and produce core dumps.

This werk patches the library to add validation in order to prevent it from accessing null pointers.