Samba: vfs_streams_xattr uninitialized memory write possible
Unknown · Unknown
4.3MediumCVSS 3.1
Recommended action
Scheduled
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Mitigation available
Distribution package intelligence
Ubuntu vendor package status
Canonical’s release and source-package findings are shown separately from local repository availability.
1 package state
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
Ubuntu release
Source package
Vendor state
Fixed version
Evidence
Ubuntu 24.04 LTSnoble · standard archive
samba
Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
1 current
CVE-2025-9640 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysamba: vfs_streams_xattr uninitialized memory write possible
175 known affected
The vendor explicitly identifies these products as affected by this CVE.
ldb-tools as a component of Red Hat Enterprise Linux 10
libldb as a component of Red Hat Enterprise Linux 10
libldb-devel as a component of Red Hat Enterprise Linux 10
libnetapi as a component of Red Hat Enterprise Linux 10
libnetapi-devel as a component of Red Hat Enterprise Linux 10
libsmbclient as a component of Red Hat Enterprise Linux 10
libsmbclient-devel as a component of Red Hat Enterprise Linux 10
libwbclient as a component of Red Hat Enterprise Linux 10
libwbclient-devel as a component of Red Hat Enterprise Linux 10
python3-ldb as a component of Red Hat Enterprise Linux 10
python3-samba as a component of Red Hat Enterprise Linux 10
python3-samba-dc as a component of Red Hat Enterprise Linux 10
Summary
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.
Remediation
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.
Optional official sources
National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.
Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.
Official European source
ENISA European Vulnerability Database
Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.
1 current
ENISA EUVD identifier
EUVD-2025-34611
No EUVD known-exploited evidence
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.
EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
4.3 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Mitigation available
01
What, why and how
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.
What
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.
Why
The product uses or accesses a resource that has not been initialized.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.
What
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.
Why
The product uses or accesses a resource that has not been initialized.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No confirmed evidence
No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.None recorded
No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
Likely attack path
a network path → Use of Uninitialized Resource → obtain information outside the intended access boundary
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness ?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-908: Use of Uninitialized Resource. The product uses or accesses a resource that has not been initialized.
CVSS vector ?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-908
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2025-34611Official EUVD mapping
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.
Official EUVD recordBSI · German · WID-SEC-W-2025-2322Samba: Mehrere Schwachstellen
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Samba ausnutzen, um beliebigen Programmcode auszuführen oder Informationen offenzulegen.
Official advisoryBSI · German · WID-SEC-W-2026-0349Dell Avamar und NetWorker: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in Dell Avamar und Dell NetWorker ausnutzen, um Angriffe zu starten, die die Integrität, Vertraulichkeit und Verfügbarkeit von Systemen beeinträchtigen.
Official advisoryBSI · German · WID-SEC-W-2026-0489Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.
Official advisoryCERT-FR · French · CERTFR-2025-AVI-0969Multiples vulnérabilités dans les produits VMware
.cve.org/CVERecord?id=CVE-2025-9165
Référence CVE CVE-2025-9230
https://www.cve.org/CVERecord?id=CVE-2025-9230
Référence CVE CVE-2025-9231
https://www.cve.org/CVERecord?id=CVE-2025-9231
Référence CVE CVE-2025-9232
https://www.cve.org/CVERecord?id=CVE-2025-9232
Référence CVE CVE-2025-9288
https://www.cve.org/CVERecord?id=CVE-2025-9288
Référence CVE CVE-2025-9340
https://www.cve.org/CVERecord?id=CVE-2025-9340
Référence CVE CVE-2025-9341
https://www.cve.org/CVERecord?id=CVE-2025-9341
Référence CVE CVE-2025-9390
https://www.cve.org/CVERecord?id=CVE-2025-9390
Référence CVE CVE-2025-9403
https://www.cve.org/CVERecord?id=CVE-2025-9403
Référence CVE CVE-2025-9640
https://www.cve.org/CVERecord?id=CVE-2025-9640
Référence CVE CVE-2025-9714
https://www.cve.org/CVERecord?id=CVE-2025-9714
Référence CVE CVE-2025-9900
https://www.cve.org/CVERecord?id=CVE-2025-9900
Gestion détaillée du document
le 06 novembre 2025
Version initiale
Alertes
Avis
Bulletins d’actualités
Mentions légales
Conditions générales
À propos
Contact
cyber.gouv.fr
service-public.fr
legifrance.gouv.fr
info.gouv.fr
france.fr
info.gouv.fr/risques
Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la
sécurité des systèmes d'information
Official advisoryCERT-FR · French · CERTFR-2025-AVI-0885Multiples vulnérabilités dans Samba
De multiples vulnérabilités ont été découvertes dans Samba. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.
Operational remediation based on structured source evidence.
Status ?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Mitigation available
Affected
ldb-tools as a component of Red Hat Enterprise Linux 10; libldb as a component of Red Hat Enterprise Linux 10; libldb-devel as a component of Red Hat Enterprise Linux 10; libnetapi as a component of Red Hat Enterprise Linux 10; libnetapi-devel as a component of Red Hat Enterprise Linux 10; libsmbclient as a component of Red Hat Enterprise Linux 10; libsmbclient-devel as a component of Red Hat Enterprise Linux 10; libwbclient as a component of Red Hat Enterprise Linux 10; libwbclient-devel as a component of Red Hat Enterprise Linux 10; python3-ldb as a component of Red Hat Enterprise Linux 10; python3-samba as a component of Red Hat Enterprise Linux 10; python3-samba-dc as a component of Red Hat Enterprise Linux 10; python3-samba-test as a component of Red Hat Enterprise Linux 10; samba as a component of Red Hat Enterprise Linux 10; samba-client as a component of Red Hat Enterprise Linux 10; samba-client-libs as a component of Red Hat Enterprise Linux 10; samba-common as a component of Red Hat Enterprise Linux 10; samba-common-libs as a component of Red Hat Enterprise Linux 10; samba-common-tools as a component of Red Hat Enterprise Linux 10; samba-dc-libs as a component of Red Hat Enterprise Linux 10; samba-dcerpc as a component of Red Hat Enterprise Linux 10; samba-devel as a component of Red Hat Enterprise Linux 10; samba-gpupdate as a component of Red Hat Enterprise Linux 10; samba-krb5-printing as a component of Red Hat Enterprise Linux 10; samba-ldb-ldap-modules as a component of Red Hat Enterprise Linux 10; samba-libs as a component of Red Hat Enterprise Linux 10; samba-pidl as a component of Red Hat Enterprise Linux 10; samba-test as a component of Red Hat Enterprise Linux 10; samba-test-libs as a component of Red Hat Enterprise Linux 10; samba-tools as a component of Red Hat Enterprise Linux 10; and 145 more
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
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.
04
Evidence and provenance
Published 15 Oct 2025 · Last source change 1 Sept 2026, 12:08 UTC · CWE-908 · Use of Uninitialized Resource
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source ?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2025-34611
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD not scheduled
Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.
Affected versionsThe structured affected or fixed version information changed.
Before
ldb-tools as a component of Red Hat Enterprise Linux 10; libldb as a component of Red Hat Enterprise Linux 10; libldb-devel as a component of Red Hat Enterprise Linux 10; libnetapi as a component of Red Hat Enterprise Linux 10; libnetapi-devel as a component of Red Hat Enterprise Linux 10; libsmbclient as a component of Red Hat Enterprise Linux 10; libsmbclient-devel as a component of Red Hat Enterprise Linux 10; libwbclient as a component of Red Hat Enterprise Linux 10; libwbclient-devel as a component of Red Hat Enterprise Linux 10; python3-ldb as a component of Red Hat Enterprise Linux 10; python3-samba as a component of Red Hat Enterprise Linux 10; python3-samba-dc as a component of Red Hat Enterprise Linux 10; python3-samba-test as a component of Red Hat Enterprise Linux 10; samba as a component of Red Hat Enterprise Linux 10; samba-client as a component of Red Hat Enterprise Linux 10; samba-client-libs as a component of Red Hat Enterprise Linux 10; samba-common as a component of Red Hat Enterprise Linux 10; samba-common-libs as a component of Red Hat Enterprise Linux 10; samba-common-tools as a component of Red Hat Enterprise Linux 10; samba-dc-libs as a component of Red Hat Enterprise Linux 10; samba-dcerpc as a component of Red Hat Enterprise Linux 10; samba-devel as a component of Red Hat Enterprise Linux 10; samba-gpupdate as a component of Red Hat Enterprise Linux 10; samba-krb5-printing as a component of Red Hat Enterprise Linux 10; samba-ldb-ldap-modules as a component of Red Hat Enterprise Linux 10; samba-libs as a component of Red Hat Enterprise Linux 10; samba-pidl as a component of Red Hat Enterprise Linux 10; samba-test as a component of Red Hat Enterprise Linux 10; samba-test-libs as a component of Red Hat Enterprise Linux 10; samba-tools as a component of Red Hat Enterprise Linux 10; and 144 more
After
ldb-tools as a component of Red Hat Enterprise Linux 10; libldb as a component of Red Hat Enterprise Linux 10; libldb-devel as a component of Red Hat Enterprise Linux 10; libnetapi as a component of Red Hat Enterprise Linux 10; libnetapi-devel as a component of Red Hat Enterprise Linux 10; libsmbclient as a component of Red Hat Enterprise Linux 10; libsmbclient-devel as a component of Red Hat Enterprise Linux 10; libwbclient as a component of Red Hat Enterprise Linux 10; libwbclient-devel as a component of Red Hat Enterprise Linux 10; python3-ldb as a component of Red Hat Enterprise Linux 10; python3-samba as a component of Red Hat Enterprise Linux 10; python3-samba-dc as a component of Red Hat Enterprise Linux 10; python3-samba-test as a component of Red Hat Enterprise Linux 10; samba as a component of Red Hat Enterprise Linux 10; samba-client as a component of Red Hat Enterprise Linux 10; samba-client-libs as a component of Red Hat Enterprise Linux 10; samba-common as a component of Red Hat Enterprise Linux 10; samba-common-libs as a component of Red Hat Enterprise Linux 10; samba-common-tools as a component of Red Hat Enterprise Linux 10; samba-dc-libs as a component of Red Hat Enterprise Linux 10; samba-dcerpc as a component of Red Hat Enterprise Linux 10; samba-devel as a component of Red Hat Enterprise Linux 10; samba-gpupdate as a component of Red Hat Enterprise Linux 10; samba-krb5-printing as a component of Red Hat Enterprise Linux 10; samba-ldb-ldap-modules as a component of Red Hat Enterprise Linux 10; samba-libs as a component of Red Hat Enterprise Linux 10; samba-pidl as a component of Red Hat Enterprise Linux 10; samba-test as a component of Red Hat Enterprise Linux 10; samba-test-libs as a component of Red Hat Enterprise Linux 10; samba-tools as a component of Red Hat Enterprise Linux 10; and 145 more
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
CVE-2025-9640: Samba: vfs_streams_xattr uninitialized memory write possible | BlackTree
