What’s Vulnerable › Vulnerabilities

CVE-2025-68246: ksmbd: close accepted socket when per-IP limit rejects connection

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-16 · updated 2026-10-14

Description

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.

Affected products

• Linux kernel: 5.15 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/35521b5a7e8a184548125f4530552101236dcda1
• https://git.kernel.org/stable/c/4587a7826be1ae0190dba10ff70b46bb0e3bc7d3
• https://git.kernel.org/stable/c/5746b2a0f5eb3d79667b3c51fe849bd62464220e
• https://git.kernel.org/stable/c/7a3c7154d5fc05956a8ad9e72ecf49e21555bfca
• https://git.kernel.org/stable/c/98a5fd31cbf72d46bf18e50b3ab0ce86d5f319a9

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