What’s Vulnerable › Vulnerabilities

CVE-2025-39692: smb: server: split ksmbd_rdma_stop_listening() out of ksmbd_rdma_destroy()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-05 · updated 2026-10-19
• Weakness: CWE-476

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 products

• Debian Linux: 11.0
• Linux kernel: from 5.15 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4; 6.17-rc1, 6.17-rc2 — fixed in 6.1.149, 6.12.44, 6.16.4, 6.6.103

How to fix

Upgrade to a fixed version: Linux kernel 6.1.149, 6.12.44, 6.16.4, 6.6.103. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/003e6a3150299f681f34cb189aa068018cef6a45
• https://git.kernel.org/stable/c/212eb86f75b4d7b82f3d94aed95ba61103bccb93
• https://git.kernel.org/stable/c/524e90e58a267dad11e23351d9e4b1f941490976
• https://git.kernel.org/stable/c/bac7b996d42e458a94578f4227795a0d4deef6fa
• https://git.kernel.org/stable/c/e41e33400516702427603f8fbbec43c91ede09c0
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html

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