Security readout for executives and security teams
Plain-English summary
CVE-2023-32250 is a critical Linux kernel ksmbd flaw in SMB session handling. A remote unauthenticated attacker could potentially execute code with kernel privileges. Exposure appears limited to systems using affected ksmbd code, and the supplied Red Hat/Fedora entries are marked unaffected.
Executive priority
Treat as urgent for environments exposing ksmbd SMB services. If ksmbd is absent or vendor packages are unaffected, priority drops to monitoring and verification. Confirm exposure before emergency disruption.
Technical view
The flaw is a race condition in ksmbd processing of SMB2_SESSION_SETUP. Missing locking around object operations can enable remote code execution in kernel context. CVSS 3.1 is 9.0 with network attack vector, no privileges, no user interaction, high impact, and high attack complexity.
Likely exposure
Most concern is for Linux systems or appliances running ksmbd with affected kernel code and reachable SMB service. The bundle specifically lists kernel 6.4-rc1 and marks RHEL 6, 7, 8, 9 and Fedora kernel packages as unaffected.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability is high impact but has high attack complexity, so urgency is driven by kernel-level RCE potential and SMB exposure, not confirmed exploitation.
Researcher notes
Key uncertainty is affected version scope beyond the listed kernel 6.4-rc1 and vendor unaffected statements. Validate using vendor advisories rather than assuming all Linux SMB servers are affected; Samba user-space deployments are not identified in this bundle.
Mitigation direction
- Check Linux distribution and appliance vendor advisories for fixed kernels or mitigations.
- Prioritize vendor-supported updates for any system confirmed to run affected ksmbd code.
- Reduce unnecessary SMB exposure, especially from untrusted networks and the internet.
- For appliances, follow vendor-specific guidance before changing SMB or kernel components.
Validation and detection
- Inventory Linux hosts and appliances that provide SMB service through ksmbd.
- Confirm kernel versions and vendor package status against official advisories.
- Verify whether SMB services are reachable from untrusted network segments.
- Track CISA KEV and vendor advisories for any exploitation or remediation updates.
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.
CWE-362: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-32250 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/CVE-2023-32250CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2208849CVE reference · issue-tracking, x_refsource_REDHAT
- https://www.zerodayinitiative.com/advisories/ZDI-23-698/CVE reference
- https://security.netapp.com/advisory/ntap-20230824-0004/CVE reference
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.
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.