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CVE-2021-33630

kernel: net/sched: cbs NULL pointer dereference when offloading is enabled

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · January 18, 2024

Updated · August 7, 2026

Description

A NULL pointer dereference flaw was found in the Linux kernel's network scheduler. This issue occurs when offloading is enabled, the cbs instance is not added to the list. The code also incorrectly handles the case when offload is disabled without removing the qdisc. This could allow a local user to cause a denial of service condition.

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

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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