CVE-2025-39692 smb: server: split ksmbd_rdma_stop_listening() out of ksmbd_rdma_destroy()
A null pointer dereference in the Linux kernel's ksmbd SMB server can cause a denial of service when stopping RDMA connections.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-39692?
CVE-2025-39692 is a medium-severity vulnerability in Debian Debian Linux, published on 5 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2025-39692?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-39692?
Apply the vendor's patch.
Is CVE-2025-39692 being exploited?
There is no known exploitation of CVE-2025-39692 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-66956, BELL-CVE-2025-39692, DEBIAN-CVE-2025-39692, GHSA-9wq2-qrhf-fmm4, ROOT-OS-DEBIAN-12-CVE-2025-39692, ROOT-OS-DEBIAN-13-CVE-2025-39692 and 3 more.