CVE-2026-31421

medium Red Hat
CVSS v3 Base Score
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Characteristics
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: April 13, 2026 (31 days ago)
Last Modified: April 13, 2026
Vendor: Red Hat
Source: REDHAT

Description

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).

CWE

CWE-476

Affected Products

Red Hat Enterprise Linux 10Red Hat Enterprise Linux 6Red Hat Enterprise Linux 7Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 lore.kernel.org