Security readout for executives and security teams
Plain-English summary
CVE-2023-32253 is a Linux kernel ksmbd denial-of-service flaw. Multiple concurrent session setup requests can trigger a deadlock, potentially making the affected SMB service or system component unavailable. The provided sources do not show data theft, privilege escalation, or active exploitation.
Executive priority
Treat this as a moderate availability risk. It matters most for Linux SMB services where downtime affects business operations, but current supplied evidence does not support emergency handling for data compromise or active exploitation.
Technical view
The flaw is in ksmbd_find_crypto_ctx() within Linux kernel ksmbd. It is classified as CWE-413 and has CVSS 3.1 score 5.9, with network attack vector, high attack complexity, no privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is most relevant to Linux systems using the in-kernel ksmbd SMB server in the affected upstream kernel ranges listed in the bundle. The Red Hat Enterprise Linux entries in the bundle are marked unaffected, so do not assume RHEL exposure from this data alone.
Exploitation context
The bundle states exploitation requires multiple concurrent session setup requests and rates attack complexity high. KEV status is false, and no cited source in the bundle reports active exploitation or public weaponization.
Researcher notes
Evidence is limited to the CVE bundle and Red Hat references. The affected description centers on a ksmbd deadlock from concurrent session setup handling. The bundle marks KEV false and Red Hat products unaffected; validate other distributions through their own advisories.
Mitigation direction
- Check kernel vendor guidance for fixed packages or recommended mitigations.
- Prioritize review of systems running affected Linux kernel ranges with ksmbd enabled.
- Do not classify listed Red Hat Enterprise Linux releases as affected based on this bundle alone.
- Where ksmbd is unnecessary, follow normal change control to disable or remove it.
Validation and detection
- Inventory Linux kernel versions across SMB-serving systems.
- Confirm whether ksmbd is installed, loaded, or providing SMB service.
- Compare affected systems against vendor advisories and package status.
- Review monitoring for SMB service hangs, kernel deadlocks, or availability incidents.
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-413: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-32253 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
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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.
SSVC decision data
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:U/C:N/I:N/A:H2.23.6redhatVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/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.
- Source timelineredhat
Made public.
- Source timelineredhat
Reported to Red Hat.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/CVE-2023-32253CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2385886CVE reference, redhat · issue-tracking, x_refsource_REDHAT
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.
Improper Resource Locking
Improper Resource Locking represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.