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CVE-2023-4515

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate command request size In commit 2b9b8f3b68ed ("ksmbd: validate command payload size"), except for SMB2_OPLOCK_BR…

Published Aug 16, 2025EPSS 0.31%

Overview

CVE-2023-4515 is a critical-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. 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 command request size

In commit 2b9b8f3b68ed ("ksmbd: validate command payload size"), except

for SMB2_OPLOCK_BREAK_HE command, the request size of other commands

is not checked, it's not expected. Fix it by add check for request

size of other commands.

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/595679098bdcdbfbba91ebe07a2f7f208df93870Refgit.kernel.org/stable/c/5aa4fda5aa9c2a5a7bac67b4a12b089ab81fee3cRefgit.kernel.org/stable/c/c6bef3bc30fd4a175aef846b7d928a6c40d091cdRefgit.kernel.org/stable/c/ff7236b66d69582f90cf5616e63cfc3dc18142bb

How CyberStrike helps

Frequently asked questions

What is CVE-2023-4515?

CVE-2023-4515 is a critical-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2023-4515?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-4515?

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-2023-4515?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-4515 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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