Samba: vfs_streams_xattr uninitialized memory write possible

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Summary

CVECVE-2025-9640
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-15 13:16:01 UTC
Updated2026-06-30 09:16:23 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

EPSS: 0.004210000 probability, percentile 0.339250000 (date 2026-07-02)

Problem Types: CWE-908 | CWE-908 Use of Uninitialized Resource | CWE-908 CWE-908 Use of Uninitialized Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2025/10/16/2 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
lists.debian.org/debian-lts-announce/2025/11/msg00027.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
www.samba.org/samba/history/security.html [email protected] www.samba.org
access.redhat.com/security/cve/CVE-2025-9640 [email protected] access.redhat.com
www.openwall.com/lists/oss-security/2025/10/15/2 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2025-08-29T03:11:02.720ZReported to Red Hat.
CNA2025-10-15T12:45:48.855ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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