4.3
MEDIUM CVSS 3.1
CVE-2025-9640
Samba: vfs_streams_xattr uninitialized memory write possible
Description

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.

INFO

Published Date :

Oct. 15, 2025, 1:16 p.m.

Last Modified :

Oct. 16, 2025, 3:28 p.m.

Remotely Exploit :

Yes !
Affected Products

The following products are affected by CVE-2025-9640 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

No affected product recoded yet

CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM 53f830b8-0a3f-465b-8143-3b8a9948e749
CVSS 3.1 MEDIUM [email protected]
Solution
Apply patches to the Samba vfs_streams_xattr module to fix heap memory writing issues.
  • Update Samba to a patched version.
  • Review Samba configuration for security.
  • Restrict access to sensitive data.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-9640.

URL Resource
https://access.redhat.com/security/cve/CVE-2025-9640
https://bugzilla.redhat.com/show_bug.cgi?id=2391698
https://www.samba.org/samba/history/security.html
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-9640 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-9640 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-9640 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2025-9640 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by [email protected]

    Oct. 15, 2025

    Action Type Old Value New Value
    Added Description 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.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
    Added Reference https://access.redhat.com/security/cve/CVE-2025-9640
    Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2391698
    Added Reference https://www.samba.org/samba/history/security.html
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 15, 2025

    Action Type Old Value New Value
    Added CWE CWE-908
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 4.3
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact