Security readout for executives and security teams
Plain-English summary
This is a Linux kernel denial-of-service issue described as memory not being released after new TCP connections. An unauthenticated remote attacker could exhaust memory and affect availability. The source bundle does not show active exploitation, and Red Hat lists the referenced RHEL versions as unaffected.
Executive priority
Treat as a moderate availability risk. It does not indicate data theft or code execution, but exposed Linux file-sharing systems could suffer outages. Validate exposure before emergency action, especially because Red Hat lists referenced releases as unaffected.
Technical view
CVE-2023-2593 concerns kernel ksmbd handling of new TCP connections, causing memory exhaustion after object lifetime ends. CVSS 3.1 is 5.9, network reachable, high complexity, no privileges or user interaction, availability-only impact. Exact affected upstream kernel versions are not identified in the provided bundle.
Likely exposure
Exposure is most relevant to Linux systems using ksmbd or similar affected kernel TCP handling reachable from untrusted networks. The provided affected list does not identify vulnerable versions and marks Red Hat Enterprise Linux 6 through 10 kernel variants as unaffected.
Exploitation context
No cited source or KEV signal in the bundle supports active exploitation. The vulnerability requires network access and high attack complexity, with impact limited to service or system availability through memory exhaustion.
Researcher notes
The bundle has incomplete affected-version detail and no named patch. The Red Hat data marks multiple RHEL releases unaffected, while the CVE description frames the flaw generically in Linux kernel TCP connection handling under a ksmbd title. Avoid broad assumptions beyond vendor confirmation.
Mitigation direction
- Check kernel vendor advisories for affected version status and fixed packages.
- Prioritize systems exposing ksmbd or related kernel TCP services to untrusted networks.
- Restrict untrusted network access to affected services where business operations allow.
- Monitor memory pressure and availability alerts on exposed Linux file-sharing hosts.
- Confirm Red Hat applicability because listed RHEL kernel packages are marked unaffected.
Validation and detection
- Inventory Linux hosts running ksmbd or relevant kernel SMB services.
- Compare kernel package versions against vendor CVE guidance and errata.
- Verify whether service ports are reachable from untrusted networks.
- Review monitoring for memory exhaustion, restarts, or availability degradation.
- Track CVE and vendor updates because affected versions are incomplete here.
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-835: 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-2023-2593 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-2023-2593CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2384787CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://lore.kernel.org/lkml/CAH2r5msyEy20e=FBx6wPWWc3kXzNR4b+zHshSqidRdFKVf_7Jg@mail.gmail.com/CVE reference, 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.