CVE-2025-9640— Samba: vfs_streams_xattr uninitialized memory write possible
Quick assessment
Affected
CVE-2025-9640
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Samba是Samba开源的一个适用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba存在安全漏洞，该漏洞源于vfs_streams_xattr模块未初始化堆内存，可能导致信息泄露。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud StorageAffected Version Matrix 11
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| None | None | < 4.21.9 |
affected |
4.22.0< 4.21.5 |
affected | ||
4.23.0< 4.23.2 |
affected | ||
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
affected |
any |
affected | ||
| Red Hat | Red Hat Enterprise Linux 7 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
affected |
any |
affected |
I. Basic Information for CVE-2025-9640
Vulnerability Information
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Vulnerability Title
Samba: vfs_streams_xattr uninitialized memory write possible
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
Samba 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Samba是Samba开源的一个适用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba存在安全漏洞，该漏洞源于vfs_streams_xattr模块未初始化堆内存，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | - | 0 ~ 4.21.9 | - |
|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2025-9640
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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IV. Related Vulnerabilities
Same weakness: CWE-908
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V. Comments for CVE-2025-9640
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