CVE-2026-53080
kernel: net/sched: cls_fw: fix NULL dereference of "old" filters before change()
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · June 24, 2026
Updated · July 24, 2026
Description
A flaw was found in the Linux kernel's traffic control firewall classifier (cls_fw) module. An attacker with the ability to create traffic control filters could exploit a vulnerability where an invalid filter, created using an older method, is processed before proper validation. This can lead to a null pointer dereference in the fw_classify() function, causing a system crash and resulting in a Denial of Service (DoS).
CVSS score applicability
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.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 · NULL Pointer Dereference