CVE-2025-9640 MEDIUM

CVE-2025-9640: Samba: vfs_streams_xattr uninitialized memory write possible

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-908
Published October 15, 2025
Last update May 13, 2026

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 15, 2025 CVE published
May 13, 2026 Record updated