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CVE-2023-32246— ksmbd: call rcu_barrier() in ksmbd_server_exit()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未调用rcu_barrier，可能导致模块卸载时执行未预期代码。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< c053e389db0d892e2ff5a60ec5e533b976503795 affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< b80422474ffe44cb5e813cd6da1f1c6bc50fd9d2 affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< d4174505016a3b2996eb7ff1530dcabbf15d47b6 affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 5a7090ccc242ab009ee7769e9d7fad6644dbe9bd affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< eb307d09fe15844fdaebeb8cc8c9b9e925430aa5 affected
5.15 affected
< 5.15 unaffected
5.15.111≤ 5.15.* unaffected
… +4 more rows
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I. Basic Information for CVE-2023-32246

Vulnerability Information
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Vulnerability Title
ksmbd: call rcu_barrier() in ksmbd_server_exit()
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未调用rcu_barrier，可能导致模块卸载时执行未预期代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ~ c053e389db0d892e2ff5a60ec5e533b976503795 -
Linux Linux 5.15 -

II. Public POCs for CVE-2023-32246

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III. Intelligence Information for CVE-2023-32246

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Same Patch Batch · Linux · 2025-08-16 · 59 CVEs total

CVE-2025-38527 9.8 CRITICAL smb: client: fix use-after-free in cifs_oplock_break
CVE-2025-38533 9.8 CRITICAL net: libwx: fix the using of Rx buffer DMA
CVE-2025-38552 9.4 CRITICAL mptcp: plug races between subflow fail and subflow creation
CVE-2023-3867 9.1 CRITICAL ksmbd: fix out of bounds read in smb2_sess_setup
CVE-2023-4515 9.1 CRITICAL ksmbd: validate command request size
CVE-2023-32249 9.1 CRITICAL ksmbd: not allow guest user on multichannel
CVE-2025-38512 8.8 HIGH wifi: prevent A-MSDU attacks in mesh networks
CVE-2025-38511 8.8 HIGH drm/xe/pf: Clear all LMTT pages on alloc
CVE-2023-4130 8.1 HIGH ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()
CVE-2023-3865 8.1 HIGH ksmbd: fix out-of-bound read in smb2_write
CVE-2025-38539 7.8 HIGH tracing: Add down_write(trace_event_sem) when adding trace event
CVE-2025-38532 7.8 HIGH net: libwx: properly reset Rx ring descriptor
CVE-2025-38536 7.8 HIGH net: airoha: fix potential use-after-free in airoha_npu_get()
CVE-2025-38542 7.8 HIGH net: appletalk: Fix device refcount leak in atrtr_create()
CVE-2025-38502 7.8 HIGH bpf: Fix oob access in cgroup local storage
CVE-2025-38550 7.8 HIGH ipv6: mcast: Delay put pmc->idev in mld_del_delrec()
CVE-2025-38514 7.5 HIGH rxrpc: Fix oops due to non-existence of prealloc backlog struct
CVE-2025-38501 7.5 HIGH ksmbd: limit repeated connections from clients with the same IP
CVE-2025-38524 7.5 HIGH rxrpc: Fix recv-recv race of completed call
CVE-2025-38526 7.5 HIGH ice: add NULL check in eswitch lag check

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-32246

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