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Back to active CVEs
Medium · CVSS 4.3CVE-2025-9640

Samba: vfs_streams_xattr uninitialized memory write possibleCVE-2025-9640

Answer in brief

CVE-2025-9640 records a Medium severity (CVSS 4.3) vulnerability in Samba: vfs_streams_xattr uninitialized memory write possible. The current sources do not mark it as known exploited. The current feed maps Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic), samba (generic), Red Hat/samba (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2025Updated Oct 18, 2026Source checked Nov 3, 2026First seen by HOL Jun 25, 2026Material review Oct 18, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-908
Source
CVE List V5
Source checked
Nov 3, 2026
References
6 linked sources
Open source record

Key facts

Risk
Medium · CVSS 4.3
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic), samba (generic), Red Hat/samba (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/openshift/ose-rhel-coreos-8generic*Not reported
Red Hat/openshift/ose-rhel-coreos-9generic*Not reported
sambageneric>=0 <4.21.9 || >=4.22.0 <4.21.5 || >=4.23.0 <4.23.24.21.9, 4.21.5, 4.23.2
Red Hat/sambageneric*Not reported
Red Hat/samba4generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/openshift/ose-rhel-coreos-8, Red Hat/openshift/ose-rhel-coreos-9, samba.
  2. 2Review the reported fix. Source-reported 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.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 25, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencelists.debian.org
  • Source referencesamba.org
  • Source referenceopenwall.com
  • Source referenceopenwall.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosureSame red hat/openshift/ose-rhel-coreos-8 package
  • Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of serviceSame red hat/openshift/ose-rhel-coreos-8 package