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CVE-2023-32249— ksmbd: not allow guest user on multichannel

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，该漏洞源于允许多通道上的访客用户，可能导致权限提升。

CVSS 9.1 · Critical EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux f5a544e3bab78142207e0242d22442db85ba1eff< ed76d3a8910be06cd4e4ba63bf6075bf903945a1 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 1f0490586544455e5be698be2e6c30077b4ec461 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 4a98e859c4673013385a54084e0cd865695ca072 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 088131b7b01099720a528a72005ff17868705d40 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2 affected
5.15 affected
< 5.15 unaffected
5.15.112≤ 5.15.* unaffected
… +4 more rows
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I. Basic Information for CVE-2023-32249

Vulnerability Information
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Vulnerability Title
ksmbd: not allow guest user on multichannel
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: not allow guest user on multichannel This patch return STATUS_NOT_SUPPORTED if binding session is guest.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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，该漏洞源于允许多通道上的访客用户，可能导致权限提升。
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 f5a544e3bab78142207e0242d22442db85ba1eff ~ ed76d3a8910be06cd4e4ba63bf6075bf903945a1 -
Linux Linux 5.15 -

II. Public POCs for CVE-2023-32249

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III. Intelligence Information for CVE-2023-32249

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

CVE-2025-38533 9.8 CRITICAL net: libwx: fix the using of Rx buffer DMA
CVE-2025-38527 9.8 CRITICAL smb: client: fix use-after-free in cifs_oplock_break
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-2025-38511 8.8 HIGH drm/xe/pf: Clear all LMTT pages on alloc
CVE-2025-38512 8.8 HIGH wifi: prevent A-MSDU attacks in mesh networks
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-2025-38532 7.8 HIGH net: libwx: properly reset Rx ring descriptor
CVE-2025-38550 7.8 HIGH ipv6: mcast: Delay put pmc->idev in mld_del_delrec()
CVE-2025-38502 7.8 HIGH bpf: Fix oob access in cgroup local storage
CVE-2025-38542 7.8 HIGH net: appletalk: Fix device refcount leak in atrtr_create()
CVE-2025-38536 7.8 HIGH net: airoha: fix potential use-after-free in airoha_npu_get()
CVE-2025-38539 7.8 HIGH tracing: Add down_write(trace_event_sem) when adding trace event
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
CVE-2025-38525 7.5 HIGH rxrpc: Fix irq-disabled in local_bh_enable()

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-2023-32249

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