CVE-2023-4515

CriticalCVSS 9.1

Published: 16/08/2025(UTC)Updated: 04/08/2026(UTC)Translated: 05/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.29%

22th percentile - higher than 22% of all known CVEs

Summary

In the Linux kernel, the ksmbd module added validation of command request sizes. Previously, except for SMB2_OPLOCK_BREAK_HE, request sizes of other commands were not checked, which could lead to improper processing.

Risk Assessment

Lack of request size validation may allow an attacker to send malicious requests, potentially leading to crashes or unauthorized access.

Recommendation

Update the Linux kernel to a version containing the fix for CVE-2023-4515 to ensure request size validation in ksmbd.

Original NVD description (English source)

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.