Use of Uninitialized Resource Affecting samba package, versions [,4.21.9)[4.22.0rc1,4.22.5)[4.23.0rc1,4.23.2)
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- published16 Oct 2025
- disclosed15 Oct 2025
- creditAndrew Walker of IX Systems and the Samba Team
Introduced: 15 Oct 2025
NewCVE-2025-9640 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade samba to version 4.21.9, 4.22.5, 4.23.2 or higher.
Overview
Affected versions of this package are vulnerable to Use of Uninitialized Resource via the vfs_streams_xattr process. An attacker can access residual heap memory fragments by writing to alternate data streams as an authenticated user with write permissions, potentially exposing non-deterministic memory content that may include sensitive information.
Note: This is only exploitable if the attacker has authenticated access and write permissions to files using the vfs_streams_xattr module.