CVE-2023-6356

Kernel: null pointer dereference in nvmet_tcp_build_iovec

Description

A flaw was found in the Linux kernel's NVMe driver. This issue may allow an unauthenticated malicious actor to send a set of crafted TCP packages when using NVMe over TCP, leading the NVMe driver to a NULL pointer dereference in the NVMe driver and causing kernel panic and a denial of service.

Remediation

Workaround:

  • To mitigate this issue, prevent module nvmet-tcp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
Affected: Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 9
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:0723 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:0724 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:0725 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:0881 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:0897 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:1248 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:2094 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:3810 third party advisory vendor advisory
https://access.redhat.com/security/cve/CVE-2023-6356 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2254054 issue tracking
https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html
https://security.netapp.com/advisory/ntap-20240415-0002/

Frequently Asked Questions

What is the severity of CVE-2023-6356?
CVE-2023-6356 has been scored as a medium severity vulnerability.
How to fix CVE-2023-6356?
As a workaround for remediating CVE-2023-6356: To mitigate this issue, prevent module nvmet-tcp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
Is CVE-2023-6356 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-6356 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-6356?
CVE-2023-6356 affects Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 9.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.