ksmbd: call rcu_barrier() in ksmbd_server_exit()
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: call rcu_barrier() in ksmbd_server_exit() racy issue is triggered the bug by racing between closing a connection and rmmod. In ksmbd, rcu_barrier() is not called at module unload time, so nothing prevents ksmbd from getting unloaded while it still has RCU callbacks pending. It leads to trigger unintended execution of kernel code locally and use to defeat protections such as Kernel Lockdown
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.15 and later | 5.15.111, 6.1.28, 6.2.15, 6.3.2, 6.4 | Patch available | CNA |
- Linux VendorLinux Affected 5.15 and later Fixed in 5.15.111, 6.1.28, 6.2.15, 6.3.2, 6.4 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.15 to before 5.15.111; 5.16 to before 6.1.28; 6.2 to before 6.2.15; 6.3 to before 6.3.2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.15 to before 5.15.111; 5.16 to before 6.1.28; 6.2 to before 6.2.15; 6.3 to before 6.3.2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.111, 6.1.28, 6.2.15, 6.3.2, 6.4
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 5 products
- Red Hat Enterprise Linux 10
- 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-2023-32246
- 2026-10-03 Alias added: GHSA-75h4-6q93-6c34
References
Patch 5
- https://git.kernel.org/stable/c/c053e389db0d892e2ff5a60ec5e533b976503795
- https://git.kernel.org/stable/c/b80422474ffe44cb5e813cd6da1f1c6bc50fd9d2
- https://git.kernel.org/stable/c/d4174505016a3b2996eb7ff1530dcabbf15d47b6
- https://git.kernel.org/stable/c/5a7090ccc242ab009ee7769e9d7fad6644dbe9bd
- https://git.kernel.org/stable/c/eb307d09fe15844fdaebeb8cc8c9b9e925430aa5
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- 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-2023-32246 · CVE Program
- CVE-2023-32246 · NVD
- FIRST EPSS
- GHSA-75h4-6q93-6c34 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-32246 · 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