What’s Vulnerable › Vulnerabilities

CVE-2024-40921: net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-12 · updated 2026-06-17

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 products

• Linux kernel: from 6.1.93 before 6.1.95; from 6.6.33 before 6.6.35; from 6.8.12 before 6.9; from 6.9.3 before 6.9.6; 6.10-rc1, 6.10-rc2, 6.10-rc3 — fixed in 6.1.95, 6.6.35, 6.9, 6.9.6

How to fix

Upgrade to a fixed version: Linux kernel 6.1.95, 6.6.35, 6.9, 6.9.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/09f4337c27f5bdeb8646a6db91488cc2f7d537ff
• https://git.kernel.org/stable/c/36c92936e868601fa1f43da6758cf55805043509
• https://git.kernel.org/stable/c/a6cc9e9a651b9861efa068c164ee62dfba68c6ca
• https://git.kernel.org/stable/c/d2dc02775fc0c4eacaee833a0637e5958884a8e5
• https://git.kernel.org/stable/c/09f4337c27f5bdeb8646a6db91488cc2f7d537ff
• https://git.kernel.org/stable/c/36c92936e868601fa1f43da6758cf55805043509
• https://git.kernel.org/stable/c/a6cc9e9a651b9861efa068c164ee62dfba68c6ca
• https://git.kernel.org/stable/c/d2dc02775fc0c4eacaee833a0637e5958884a8e5
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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