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CVE-2023-3866

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate session id and tree id in the compound request This patch validate session id and tree id in compound request.

Published Aug 16, 2025CWE-476EPSS 12.47%

Overview

CVE-2023-3866 is a high-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: validate session id and tree id in the compound request

This patch validate session id and tree id in compound request.

If first operation in the compound is SMB2 ECHO request, ksmbd bypass

session and tree validation. So work->sess and work->tcon could be NULL.

If secound request in the compound access work->sess or tcon, It cause

NULL pointer dereferecing error.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/5005bcb4219156f1bf7587b185080ec1da08518eRefgit.kernel.org/stable/c/854156d12caa9d36de1cf5f084591c7686cc8a9dRefgit.kernel.org/stable/c/d1066c1b3663401cd23c0d6e60cdae750ce00c0fRefgit.kernel.org/stable/c/eb947403518ea3d93f6d89264bb1f5416bb0c7d0

How CyberStrike helps

Frequently asked questions

What is CVE-2023-3866?

CVE-2023-3866 is a high-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-3866?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-3866?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-3866?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-3866 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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