Use of Uninitialized Resource Affecting samba package, versions [,4.21.9)[4.22.0rc1,4.22.5)[4.23.0rc1,4.23.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-SAMBA-13560498
- published16 Oct 2025
- disclosed15 Oct 2025
- creditAndrew Walker of IX Systems and the Samba Team
Introduced: 15 Oct 2025
CVE-2025-9640 (opens in a new tab)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.