Security readout for executives and security teams
Plain-English summary
A Linux CIFS client locking flaw could allow unsafe access to connection fields. The supplied CVSS assessment rates potential confidentiality, integrity, and availability impact as high, but the public description does not explain the failure mode or practical attack sequence.
Executive priority
Prioritize timely remediation on servers and endpoints that actively use CIFS, especially business-critical file workflows. Broader emergency action is not supported by the available exploitation evidence. Require owners to confirm exposure because the supplied version records are ambiguous.
Technical view
The CIFS code protected some tree-connection (tcon) fields with the broad cifs_tcp_ses_lock after dedicated tc_lock protection had been introduced. The fix replaces those remaining lock uses with tc_lock. The bundle does not identify a CWE, specific race outcome, trigger, or demonstrated security impact.
Likely exposure
Treat systems using Linux CIFS/SMB client functionality as potentially exposed when their kernels match the supplied affected records. The version data is not expressed as a clear range, so package-level exposure requires confirmation through distribution guidance or fix-commit ancestry.
Exploitation context
The CVSS vector describes network access, low complexity, no privileges, and required user interaction. However, the bundle provides no attack scenario, proof of concept, or evidence of active exploitation. The CVE is not marked as included in KEV.
Researcher notes
The security rationale appears to involve incorrect synchronization of tcon fields, but the sources do not document the vulnerable interleaving, affected fields, resulting corruption, or attacker-controlled conditions. Stable commits are available for ancestry analysis. Avoid inferring remote code execution or a specific memory-safety class from CVSS alone.
Mitigation direction
- Update to a vendor-supported kernel incorporating the applicable referenced stable fix.
- Consult Linux distribution guidance to map the upstream records to packaged kernel versions.
- Prioritize systems actively using CIFS mounts while package-level exposure is confirmed.
Validation and detection
- Inventory running kernel versions and identify systems using CIFS modules or mounts.
- Confirm the installed kernel includes the applicable fix commit or distribution backport.
- Reboot updated systems and verify the corrected kernel is running.
- Regression-test required CIFS mounts and connection workflows after updating.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2026-43215 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:R/S:U/C:H/I:H/A:H2.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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/953953abb66e52c224057ab91e404284fefeab62CVE reference, Linux
- https://git.kernel.org/stable/c/601dd3b79769b38d30b693c40afdb2a4b7edf9d0CVE reference, Linux
- https://git.kernel.org/stable/c/3969db6b22e3d90d8c5f22ac1a7fe0350a94c136CVE reference, Linux
- https://git.kernel.org/stable/c/8c59eeeeffa1524ef57e173a89a1a3ff539888d5CVE reference, Linux
- https://git.kernel.org/stable/c/96c4af418586ee9a6aab61738644366426e05316CVE 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.