CVE-2025-9640

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.

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-25)

CWE

CWE-908

Published

2025-10-15

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

References

• 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
• http://www.openwall.com/lists/oss-security/2025/10/15/2
• http://www.openwall.com/lists/oss-security/2025/10/16/2

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