Information Disclosure Vulnerability in Samba by the Samba Team

CVE-2025-9640

What is CVE-2025-9640?

CVE-2025-9640 is an information disclosure vulnerability identified in Samba, a widely used open-source software suite that enables file and print services for various operating systems, including UNIX and Windows. The specific issue is located in the vfs_streams_xattr module, where uninitialized heap memory may be written into alternate data streams. This flaw potentially allows an authenticated user to access residual memory content, which may contain sensitive information such as user credentials, cryptographic keys, or other confidential data. The gravity of this vulnerability is underscored by the fact that its exploit could lead to unauthorized access to sensitive information, placing organizations at risk for data breaches and compliance violations.

Potential impact of CVE-2025-9640

1. Data Breach Risk: Exploitation of this vulnerability can result in the unauthorized disclosure of sensitive information, leading to potential data breaches. Compromised data may include personally identifiable information (PII) and corporate secrets, which can severely impact an organization's reputation and lead to financial loss.

2. Compliance Violations: Organizations that fail to protect sensitive information may be in violation of data protection regulations such as GDPR or HIPAA. Such violations can attract fines, legal consequences, and loss of customer trust.

3. Operational Disruption: The capability to access and leak sensitive data can disrupt normal business operations. Additionally, organizations may need to allocate significant resources for incident response, forensic investigations, and remediation efforts to restore security and organizational confidence.

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