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Vulnerability DatabaseCVE-2023-4515
CVE-2023-4515:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2023-4515 is a vulnerability in the Linux kernel's ksmbd component that was disclosed on August 16, 2025. The issue relates to insufficient validation of command request sizes in the SMB server implementation. Specifically, in commit 2b9b8f3b68ed ("ksmbd: validate command payload size"), the request size validation was missing for all commands except SMB2OPLOCKBREAK_HE (NVD, Ubuntu).
Technical details
The vulnerability exists in the ksmbd subsystem of the Linux kernel, where command request sizes were not properly validated except for the SMB2OPLOCKBREAK_HE command. This oversight in input validation could potentially lead to security issues. The fix involves adding proper size checks for all command requests (NVD).
Mitigation and workarounds
Multiple Linux distributions have released patches to address this vulnerability. Ubuntu has fixed this in various kernel versions including 5.15.0-91.101 for 22.04 LTS and 5.15.0-1053.61 for 20.04 LTS. Red Hat has also addressed this in their Enterprise Linux updates (Ubuntu, Red Hat).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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