CVE-2024-40920

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

HIGH
7.8
CVSS Score
Published: July 12, 2024 at 12:25 PM UTC
Updated: August 4, 2026 at 04:06 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: fix suspicious rcu usage in br_mst_set_state I converted br_mst_set_state to RCU to avoid a vlan use-after-free but forgot to change the vlan group dereference helper. Switch to vlan group RCU deref helper to fix the suspicious rcu usage warning.

Affected

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

Vendor states this is fixed in 406bfc04b01ee47e4c626f77ecc7d9f85135b166 (fixed)
Vendor states this is fixed in 546ceb1dfdac866648ec959cbc71d9525bd73462 (fixed)
Vendor states this is fixed in 7caefa2771722e65496d85b62e1dc4442b7d1345 (fixed)
Vendor states this is fixed in caaa2129784a04dcade0ea92c12e6ff90bbd23d8 (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/406bfc04b01ee47e4c626f77ecc7d9f85135b166
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/546ceb1dfdac866648ec959cbc71d9525bd73462
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/7caefa2771722e65496d85b62e1dc4442b7d1345
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/caaa2129784a04dcade0ea92c12e6ff90bbd23d8
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
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

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