Linux Kernel Vulnerability Affecting ICMP Protocol Handling
CVE-2026-23398

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 26 March 2026

What is CVE-2026-23398?

A vulnerability in the Linux kernel's ICMP protocol handling could lead to a kernel panic upon receiving specific ICMP Fragmentation Needed errors. The issue arises from the unconditional dereference of an unregistered protocol's handler, which may result in a NULL pointer dereference. This occurs particularly when the ip_no_pmtu_disc setting is configured with hardened PMTU mode. Proper checks must be implemented to ensure that the protocol has registered handlers before accessing related functions to prevent potential system crashes.

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