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 v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	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
http://www.openwall.com/lists/oss-security/2025/10/15/2
http://www.openwall.com/lists/oss-security/2025/10/16/2
https://lists.debian.org/debian-lts-announce/2025/11/msg00027.html

Configurations

No configuration.

History

18 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Se encontró un fallo en Samba, en el módulo vfs_streams_xattr, donde se podría escribir memoria de pila no inicializada en flujos de datos alternativos. Esto permite a un usuario autenticado leer contenido de memoria residual que podría incluir datos sensibles, lo que resulta en una vulnerabilidad de revelación de información.

Information

Published : 2025-10-15 13:16

Updated : 2026-10-18 21:10

NVD link : CVE-2025-9640

Mitre link : CVE-2025-9640

CVE.ORG link : CVE-2025-9640

JSON object : View

Products Affected

No product.

CWE

CWE-908

Use of Uninitialized Resource

{"id": "CVE-2025-9640", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-9640", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-15T13:06:54.860646Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secalert@redhat.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "affected": [{"source": "secalert@redhat.com", "affectedData": [{"versions": [{"status": "affected", "version": "0", "lessThan": "4.21.9", "versionType": "semver"}, {"status": "affected", "version": "4.22.0", "lessThan": "4.21.5", "versionType": "semver"}, {"status": "affected", "version": "4.23.0", "lessThan": "4.23.2", "versionType": "semver"}], "packageName": "samba", "collectionURL": "https://www.samba.org/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:10"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "samba", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "samba", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "samba4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "samba", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "samba", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "samba", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "openshift/ose-rhel-coreos-8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "openshift/ose-rhel-coreos-9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}]}], "published": "2025-10-15T13:16:01.997", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2025-9640", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2391698", "source": "secalert@redhat.com"}, {"url": "https://www.samba.org/samba/history/security.html", "source": "secalert@redhat.com"}, {"url": "http://www.openwall.com/lists/oss-security/2025/10/15/2", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.openwall.com/lists/oss-security/2025/10/16/2", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/11/msg00027.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-908"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-908"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en Samba, en el m\u00f3dulo vfs_streams_xattr, donde se podr\u00eda escribir memoria de pila no inicializada en flujos de datos alternativos. Esto permite a un usuario autenticado leer contenido de memoria residual que podr\u00eda incluir datos sensibles, lo que resulta en una vulnerabilidad de revelaci\u00f3n de informaci\u00f3n."}], "lastModified": "2026-10-18T21:10:00.120", "sourceIdentifier": "secalert@redhat.com"}