SMB Client Directory Query Double-Free Vulnerability

Executive Summary

This vulnerability in the Linux kernel involves a double-free issue in the SMB client component. When a response-bearing attempt returns a replayable error and frees its response buffer, a subsequent failure in SMB2_query_directory_init() before the next send can cause cleanup to free the previous response buffer again, leading to a double-free condition.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability is specific to the Linux kernel's SMB client implementation. Detection requires checking kernel logs for SMB-related errors or crashes, particularly after failed directory queries. Monitor logs with commands like 'dmesg | grep smb' or 'journalctl -k | grep smb'. If kernel panics or SMB client errors occur, further investigation is needed.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability could lead to system crashes or potential code execution if exploited. It specifically affects systems using the SMB client functionality in the Linux kernel, potentially causing instability or denial of service.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability is specific to the Linux kernel's SMB client functionality and involves a double-free issue during directory query operations. It does not directly impact compliance with standards like GDPR or HIPAA, as those focus on data protection, privacy, and security controls rather than kernel-level memory management flaws.

Useful 0 Not Useful 0

Mitigation Strategies

Apply the latest Linux kernel security updates to patch this issue. If immediate patching is not possible, consider disabling SMB client functionality temporarily or restricting SMB access via firewall rules until the update is applied.

Useful 0 Not Useful 0