Security readout for executives and security teams
Plain-English summary
This flaw can crash affected Linux systems that use NVMe over TCP. The business impact is service outage, not data theft or privilege escalation. Urgency depends on whether affected Red Hat kernels are deployed on reachable NVMe/TCP storage paths.
Executive priority
Treat as a targeted availability risk. Patch in normal accelerated maintenance for storage and virtualization infrastructure, faster if NVMe over TCP is externally reachable or supports critical services.
Technical view
CVE-2023-6356 is a CWE-476 NULL pointer dereference in the Linux kernel NVMe driver, specifically nvmet_tcp_build_iovec. Crafted TCP traffic against NVMe over TCP can trigger a kernel panic and denial of service. The bundle rates it CVSS 6.5 medium with availability impact only.
Likely exposure
Exposure is most likely on affected RHEL 8, RHEL 8 EUS, RHEL 9, RHEL 9 EUS, Red Hat Virtualization, and listed RHOL 5.8 RHEL 9 packages where NVMe over TCP is enabled or reachable.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The description says crafted TCP packets can trigger the crash when NVMe over TCP is in use, while the CVSS vector lists low privileges required.
Researcher notes
Evidence is strongest for Red Hat affected packages and advisory coverage. The bundle includes a notable inconsistency: description suggests unauthenticated crafted TCP traffic, but CVSS lists PR:L. Do not claim exploitation without new evidence.
Mitigation direction
- Apply relevant Red Hat security advisories and kernel updates for affected systems.
- Prioritize storage hosts, virtualization hosts, and clusters using NVMe over TCP.
- Restrict NVMe over TCP exposure to trusted storage networks where operationally required.
- Disable or remove NVMe over TCP paths where they are not used.
- Check non-Red Hat vendor advisories before assuming unaffected status.
Validation and detection
- Inventory kernels and packages against the affected Red Hat versions in the bundle.
- Confirm whether NVMe over TCP is enabled or reachable on each system.
- Review outage logs for unexplained kernel panics on storage-connected hosts.
- Verify patched kernel versions after maintenance windows.
- Track remediation against RHSA-2024 advisories listed in the sources.
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-476: 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-2023-6356 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2024:0723CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0724CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0725CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0881CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0897CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:1248CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:2094CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:3810CVE reference · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2023-6356CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2254054CVE reference · issue-tracking, x_refsource_REDHAT
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.htmlCVE reference · x_transferred
- https://security.netapp.com/advisory/ntap-20240415-0002/CVE reference · x_transferred
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZFYW6R64GPLUOXSQBJI3JBUX3HGLAYPP/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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.