Bug 2422770 (CVE-2025-68246)

Summary: CVE-2025-68246 kernel: ksmbd: Remote Denial of Service via socket leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in ksmbd (kernel SMB daemon) in the Linux kernel. A remote attacker can exploit this vulnerability by exceeding the per-IP connection limit. This leads to a socket leak for each rejected connection attempt, which can result in a denial of service (DoS) due to resource exhaustion.
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Description OSIDB Bzimport 2025-12-16 15:03:47 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: close accepted socket when per-IP limit rejects connection

When the per-IP connection limit is exceeded in ksmbd_kthread_fn(),
the code sets ret = -EAGAIN and continues the accept loop without
closing the just-accepted socket. That leaks one socket per rejected
attempt from a single IP and enables a trivial remote DoS.

Release client_sk before continuing.

This bug was found with ZeroPath.
Comment 1 Alexander B 2025-12-16 21:32:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121634-CVE-2025-68246-7c3d@gregkh/T