CVE-2024-40920

kernel: net: bridge: mst: fix suspicious rcu usage in br_mst_set_state

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · July 12, 2024

Updated · August 5, 2026

Description

A vulnerability was found in the Linux kernel's bridge subsystem, related to Multiple Spanning Tree (MST). The br_mst_set_state function was converted to use RCU to prevent a VLAN use-after-free, but fails to update the VLAN group dereference helper. This leads to warnings about improper RCU usage.

Statement

Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.

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-416 · Use After Free