Bug 2297504 (CVE-2024-40920) - CVE-2024-40920 kernel: net: bridge: mst: fix suspicious rcu usage in br_mst_set_state
Summary: CVE-2024-40920 kernel: net: bridge: mst: fix suspicious rcu usage in br_mst_s...
Keywords:
Status: NEW
Alias: CVE-2024-40920
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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TreeView+ depends on / blocked
 
Reported: 2024-07-12 13:32 UTC by OSIDB Bzimport
Modified: 2024-10-01 18:22 UTC (History)
4 users (show)

Fixed In Version: kernel 6.1.95, kernel 6.6.35, kernel 6.9.6, kernel 6.10-rc4
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Doc Text:
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.
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Description OSIDB Bzimport 2024-07-12 13:32:22 UTC 
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.
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