net: bridge: mst: fix suspicious rcu usage in br_mst_set_state
Priority LOW 34CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00414 35th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.9, 6.1.95, 6.6.35 +1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 6.8.12 to before 6.9 | 6.9 | Patch available | CNA |
| Linux | Linux | 6.1.93 to before 6.1.95; 6.6.33 to before 6.6.35; 6.9.3 to before 6.9.6 | 6.1.95, 6.6.35, 6.9.6 | Patch available | CNA |
- Linux VendorLinux Affected 6.8.12 to before 6.9 Fixed in 6.9 Patch available CNA
- Linux VendorLinux Affected 6.1.93 to before 6.1.95; 6.6.33 to before 6.6.35; 6.9.3 to before 6.9.6 Fixed in 6.1.95, 6.6.35, 6.9.6 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.1.93 to before 6.1.95; 6.6.33 to before 6.6.35; 6.8.12 to before 6.9; 6.9.3 to before 6.9.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:* | 6.10 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.10:rc2:*:*:*:*:*:* | 6.10 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.10:rc3:*:*:*:*:*:* | 6.10 rc3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.1.93 to before 6.1.95; 6.6.33 to before 6.6.35; 6.8.12 to before 6.9; 6.9.3 to before 6.9.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:* Versions 6.10 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.10:rc2:*:*:*:*:*:* Versions 6.10 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.10:rc3:*:*:*:*:*:* Versions 6.10 rc3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.9
- Fix · CNA Linux (Linux) Fixed in 6.1.95, 6.6.35, 6.9.6
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2024-40920
- 2026-10-03 Alias added: GHSA-5c2v-7jgp-gfhr
References
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2024-40920 · CVE Program
- CVE-2024-40920 · NVD
- FIRST EPSS
- GHSA-5c2v-7jgp-gfhr · GitHub Advisory Database · CC BY 4.0
- CVE-2024-40920 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences