CVE-2026-31421

A flaw was found in the Linux kernel's cls_fw network scheduler component. This vulnerability, a null pointer dereference, occurs when an empty cls_fw filter is attached to a shared block and a specially crafted network packet with a specific mark is processed. An attacker with network access could potentially exploit this to cause a system crash, leading to a Denial of Service (DoS).

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.