CVE-2024-40921

net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state

MEDIUM
5.5
CVSS Score
Published: July 12, 2024 at 12:25 PM UTC
Updated: June 17, 2026 at 07:46 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state Pass the already obtained vlan group pointer to br_mst_vlan_set_state() instead of dereferencing it again. Each caller has already correctly dereferenced it for their context. This change is required for the following suspicious RCU dereference fix. No functional changes intended.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vendor states this is fixed in 09f4337c27f5bdeb8646a6db91488cc2f7d537ff (fixed)
Vendor states this is fixed in 36c92936e868601fa1f43da6758cf55805043509 (fixed)
Vendor states this is fixed in a6cc9e9a651b9861efa068c164ee62dfba68c6ca (fixed)
Vendor states this is fixed in d2dc02775fc0c4eacaee833a0637e5958884a8e5 (fixed)
Affected range stops below 6.1.95, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.6.35, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.9.6, so it looks safe — our inference, not a vendor statement

References (5)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/09f4337c27f5bdeb8646a6db91488cc2f7d537ff
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/36c92936e868601fa1f43da6758cf55805043509
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a6cc9e9a651b9861efa068c164ee62dfba68c6ca
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d2dc02775fc0c4eacaee833a0637e5958884a8e5
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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