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CVE-2025-9640

Good to know:

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Date: October 15, 2025

A flaw was found in Samba, in the vfs_streams_xattr module, where uninitialized heap memory could be written into alternate data streams. This allows an authenticated user to read residual memory content that may include sensitive data, resulting in an information disclosure vulnerability.

Severity Score

Related Resources (7)

https://bugzilla.redhat.com/show_bug.cgi?id=2391698
https://www.samba.org/samba/history/security.html
https://access.redhat.com/security/cve/CVE-2025-9640
https://nvd.nist.gov/vuln/detail/CVE-2025-9640
http://www.openwall.com/lists/oss-security/2025/10/16/2
http://www.openwall.com/lists/oss-security/2025/10/15/2
https://www.mend.io/vulnerability-database/CVE-2025-9640

Severity Score

Weakness Type (CWE)

Use of Uninitialized Resource

CWE-908

Top Fix

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Upgrade Version

Upgrade to version https://github.com/samba-team/samba.git - samba-4.21.9;https://github.com/samba-team/samba.git - samba-4.23.2;https://github.com/samba-team/samba.git - samba-4.22.5

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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