CVE-2025-9640: Use of Uninitialized Resource
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.
AI Analysis
Technical Summary
This vulnerability in Samba's vfs_streams_xattr module involves the use of uninitialized heap memory that can be written into alternate data streams. This flaw allows an authenticated user to read residual memory content, which may include sensitive information, resulting in an information disclosure issue. The vulnerability is identified as CWE-908 and affects Samba versions 4.22.0 and 4.23.0 as shipped with Red Hat Enterprise Linux 10. There is no explicit patch or fix referenced in the vendor advisory content provided.
Potential Impact
The impact is limited to information disclosure where an authenticated user can read uninitialized memory content. This may expose sensitive data but does not affect integrity or availability. The CVSS 3.1 base score is 4.3 (medium), reflecting the limited scope and requirement for authentication.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2025-9640 for current remediation guidance. No explicit patch or workaround is mentioned in the provided advisory content. Users should monitor the vendor advisory for updates and apply official fixes once available.
CVE-2025-9640: Use of Uninitialized Resource
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.
CVSS v3.1
Score 4.3medium
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Samba's vfs_streams_xattr module involves the use of uninitialized heap memory that can be written into alternate data streams. This flaw allows an authenticated user to read residual memory content, which may include sensitive information, resulting in an information disclosure issue. The vulnerability is identified as CWE-908 and affects Samba versions 4.22.0 and 4.23.0 as shipped with Red Hat Enterprise Linux 10. There is no explicit patch or fix referenced in the vendor advisory content provided.
Potential Impact
The impact is limited to information disclosure where an authenticated user can read uninitialized memory content. This may expose sensitive data but does not affect integrity or availability. The CVSS 3.1 base score is 4.3 (medium), reflecting the limited scope and requirement for authentication.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2025-9640 for current remediation guidance. No explicit patch or workaround is mentioned in the provided advisory content. Users should monitor the vendor advisory for updates and apply official fixes once available.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- redhat
- Date Reserved
- 2025-08-29T03:11:20.482Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2025-9640","vendor":"Red Hat"}]
Threat ID: 68ef9b21178f764e1f470999
Added to database: 10/15/2025, 13:01:21 UTC
Last enriched: 07/02/2026, 22:00:15 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 247
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.