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CVE-2023-3865

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out-of-bound read in smb2_write ksmbd_smb2_check_message doesn't validate hdr->NextCommand.

Published Aug 16, 2025CWE-125EPSS 0.63%

Overview

CVE-2023-3865 is a high-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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

ksmbd: fix out-of-bound read in smb2_write

ksmbd_smb2_check_message doesn't validate hdr->NextCommand. If

->NextCommand is bigger than Offset + Length of smb2 write, It will

allow oversized smb2 write length. It will cause OOB read in smb2_write.

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/3813eee5154d6a4c5875cb4444cb2b63bac8947fRefgit.kernel.org/stable/c/58a9c41064df27632e780c5a3ae3e0e4284957d1Refgit.kernel.org/stable/c/5fe7f7b78290638806211046a99f031ff26164e1Refgit.kernel.org/stable/c/c86211159bc3178b891e0d60e586a32c7b6a231b

How CyberStrike helps

Frequently asked questions

What is CVE-2023-3865?

CVE-2023-3865 is a high-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2023-3865?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-3865?

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-2023-3865?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-3865 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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