Security readout for executives and security teams
Plain-English summary
A Linux SMB client flaw can mishandle a channel reconnection, scheduling delayed work through an incorrectly initialized connection object. The published assessment treats the resulting availability loss as high severity, with no indicated confidentiality or integrity impact. Organizations relying on Linux CIFS/SMB mounts should prioritize version validation and vendor-provided kernel updates.
Executive priority
Treat this as a high-priority availability issue for production systems dependent on Linux SMB mounts, but not as evidence of an ongoing breach. Expedite validation and kernel patching where outages would be material. Lower priority may be reasonable for systems confirmed not to use the CIFS/SMB client.
Technical view
In smb2_reconnect_server(), a dummy tcon passed to smb2_reconnect() has query_interface uninitialized. Delayed work is consequently queued from the wrong tcon, triggering a kernel workqueue warning. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, scoring 7.5 and indicating availability impact only.
Likely exposure
Exposure is most likely on Linux hosts actively using the CIFS/SMB client and encountering SMB channel reconnection. The record lists four Git commit identifiers and versions 6.6.95, 6.12.35, and 6.15.4 under affected data. Complete range semantics and distribution package mappings are not provided in the bundle.
Exploitation context
KEV is false, and the supplied sources provide no evidence of active exploitation or a public exploit. The CVSS vector describes a network attack path requiring no privileges or user interaction, but the bundle documents only the reconnection defect and availability impact; it does not establish practical exploitability across deployments.
Researcher notes
No CWE is supplied. The documented defect is workqueue misuse during SMB channel reconnection, caused by an uninitialized query_interface in a dummy tcon. The record includes four stable-kernel fix references, but the normalized bundle omits detailed range boundaries and distribution backport status.
Mitigation direction
- Apply a vendor-supported kernel update containing the relevant stable fix for your kernel branch.
- Check distribution advisories to map packaged kernels to the cited upstream fix commits.
- Limit unnecessary SMB client use on critical hosts until affected builds are updated.
- Maintain operational redundancy for essential SMB-dependent services during remediation.
Validation and detection
- Inventory Linux hosts using the CIFS client and identify their exact running kernel builds.
- Compare each build with distribution guidance and the four cited Linux stable commits.
- Confirm the updated kernel is running after maintenance, not merely installed.
- Review existing kernel logs for smb2_reconnect_server or __queue_delayed_work warnings.
- Monitor SMB-dependent services for reconnection-related availability failures.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2025-38379 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6LinuxVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/0cee638d92ac898d73eccc4e4bab70e9fc95946aCVE reference, Linux
- https://git.kernel.org/stable/c/3f6932ef25378794894c3c1024092ad14da2d330CVE reference, Linux
- https://git.kernel.org/stable/c/9d2b629a9dc5c72537645533af1cb11a7d34c4b1CVE reference, Linux
- https://git.kernel.org/stable/c/3bbe46716092d8ef6b0df4b956f585c5cd0fc78eCVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.