CVE-2023-6356Network attack vector

Kernel panic via malformed NVMe H2C PDU

Published Feb 7, 2024 · Updated Nov 6, 2025

NULL pointer dereference in the NVMe-oF/TCP target in Red Hat Enterprise Linux allows remote authenticated users to crash the kernel. The subsystem fails to validate H2C PDU data before nvmet_tcp_build_iovec uses an absent I/O vector and dereferences NULL. Reachability requires an exposed NVMe-over-TCP target; successful exploitation causes a kernel panic without reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the NVMe-oF/TCP target in Red Hat Enterprise Linux allows remote authenticated users to crash the kernel. The subsystem fails to validate H2C PDU data before nvmet_tcp_build_iovec uses an absent I/O vector and dereferences NULL. Reachability requires an exposed NVMe-over-TCP target; successful exploitation causes a kernel panic without reported data disclosure or modification.

The record

CVE
CVE-2023-6356
Published
Feb 7, 2024
Updated
Nov 6, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 8
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update SupportAffected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update SupportAffected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update SupportAffected versions are unavailable in this record.
Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

6.5Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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