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CVE-2026-22976

kernel: Linux kernel: Denial of Service in sch_qfq due to NULL pointer dereference

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · January 21, 2026

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel's sch_qfq (Quick Fair Queueing) scheduler. This vulnerability allows a local user to trigger a NULL pointer dereference in the qfq_reset function. The issue arises when multiple qfq_class objects incorrectly reference the same leaf_qdisc, leading to an attempt to deactivate an already inactive aggregate. Successful exploitation of this flaw can result in a system crash, causing 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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference