CVE-2026-23391

A flaw was found in the Linux kernel’s netfilter subsystem. When a netfilter template rule is removed, packets that are still queued and refer to the removed template are not properly dropped. This improper handling of packets could lead to resource exhaustion or unexpected system behavior, potentially resulting in a denial of service.

This flaw affects systems using nfqueue with connection tracking templates. When templates referencing helpers or timeout policies are removed while packets are queued, those packets can reference freed objects. The issue occurs during module removal or timeout policy deletion while traffic is being processed via nfqueue.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.