CVE-2025-39692

smb: server: split ksmbd_rdma_stop_listening() out of ksmbd_rdma_destroy()

MEDIUM
5.5
CVSS Score
Published: September 5, 2025 at 05:20 PM UTC
Updated: October 19, 2026 at 09:10 PM UTC
3 products affected across 3 vendorsLinux KernelDebian LinuxSIMATIC CN 4100

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: smb: server: split ksmbd_rdma_stop_listening() out of ksmbd_rdma_destroy() We can't call destroy_workqueue(smb_direct_wq); before stop_sessions()! Otherwise already existing connections try to use smb_direct_wq as a NULL pointer.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

5.15 ≤ v < 6.1.1496.13 ≤ v < 6.16.46.2 ≤ v < 6.6.1036.7 ≤ v < 6.12.445.156.176.17 rc16.17 rc2626e6641f6b467447c81dd7678a69c66f7746cf
Vendor states this is fixed in 003e6a3150299f681f34cb189aa068018cef6a45 (fixed)
Vendor states this is fixed in 212eb86f75b4d7b82f3d94aed95ba61103bccb93 (fixed)
Vendor states this is fixed in 524e90e58a267dad11e23351d9e4b1f941490976 (fixed)
Vendor states this is fixed in bac7b996d42e458a94578f4227795a0d4deef6fa (fixed)
Vendor states this is fixed in e41e33400516702427603f8fbbec43c91ede09c0 (fixed)
Vendor states this is fixed in 5.15 (unaffected)
Vendor states this is fixed in 6.1.149 (unaffected)
Vendor states this is fixed in 6.12.44 (unaffected)
Vendor states this is fixed in 6.16.4 (unaffected)
Vendor states this is fixed in 6.17 (unaffected)
Vendor states this is fixed in 6.6.103 (unaffected)
v < V5.0
Affected range stops below V5.0, so it looks safe — our inference, not a vendor statement

References (7)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/003e6a3150299f681f34cb189aa068018cef6a45
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/212eb86f75b4d7b82f3d94aed95ba61103bccb93
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/524e90e58a267dad11e23351d9e4b1f941490976
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/bac7b996d42e458a94578f4227795a0d4deef6fa
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e41e33400516702427603f8fbbec43c91ede09c0
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-032379.html

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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