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CVE-2023-6535· NVD / CVE Program· CNA redhat

Kernel: null pointer dereference in nvmet_tcp_execute_request

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.5% (FIRST EPSS); higher than 74.4% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: bpftool (AlmaLinux:8) 4.18.0-513.18.1.el8_9; kernel (AlmaLinux:8) 4.18.0-513.18.1.el8_9; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-513.18.1.el8_9.

Low priority for now. Upgrade to bpftool (AlmaLinux:8) 4.18.0-513.18.1.el8_9; kernel (AlmaLinux:8) 4.18.0-513.18.1.el8_9; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-513.18.1.el8_9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

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, causing kernel panic and a denial of service.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Feb 7, 2024
Updated
Jun 17, 2026
EPSS
1.5% · 74th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · redhat
6.5
1.0 point gap

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-6535

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatcodeready linux builder eus
redhatcodeready linux builder eus for power little endian eus
redhatcodeready linux builder for arm64 eus
redhatcodeready linux builder for ibm z systems eus
redhatenterprise linux
redhatenterprise linux eus
redhatenterprise linux for arm 64 eus
redhatenterprise linux for ibm z systems eus
redhatenterprise linux for power little endian eus
redhatenterprise linux for real time
redhatenterprise linux for real time for nfv

and 4 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelall versions
  • redhat codeready linux builder eus8.6
  • redhat codeready linux builder eus9.2
  • redhat codeready linux builder eus for power little endian eus8.6_ppc64le
  • redhat codeready linux builder eus for power little endian eus9.2_ppc64le
  • redhat codeready linux builder for arm64 eus8.6_aarch64
  • redhat codeready linux builder for arm64 eus9.2_aarch64
  • redhat codeready linux builder for ibm z systems eus9.2_s390x
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0
  • redhat enterprise linux eus8.6
  • redhat enterprise linux eus9.2
  • redhat enterprise linux for arm 64 eus8.6_aarch64
  • redhat enterprise linux for arm 64 eus9.2_aarch64
  • redhat enterprise linux for ibm z systems eus8.6_s390x
  • redhat enterprise linux for ibm z systems eus9.2_s390x
  • redhat enterprise linux for power little endian eus8.6_ppc64le
  • redhat enterprise linux for power little endian eus9.2_ppc64le
  • redhat enterprise linux for real time9.2
  • redhat enterprise linux for real time for nfv9.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • 0:4.18.0-513.18.1.rt7.320.el8_9 and laternot affected · rpm
    • 0:4.18.0-513.18.1.el8_9 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support

    • 0:4.18.0-372.91.1.el8_6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support

    • 0:4.18.0-477.58.1.el8_8 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:5.14.0-362.24.1.el9_3 and laternot affected · rpm
    • 0:5.14.0-362.24.1.el9_3 and laternot affected · rpm
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support

    • 0:5.14.0-284.52.1.el9_2 and laternot affected · rpm
    • 0:5.14.0-284.52.1.rt14.337.el9_2 and laternot affected · rpm

  • Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8

    • 0:4.18.0-372.91.1.el8_6 and laternot affected · rpm

  • Red Hat RHOL-5.8-RHEL-9

    • v5.8.6-22 and laternot affected · rpm
    • v5.8.6-11 and laternot affected · rpm
    • v6.8.1-407 and laternot affected · rpm
    • v5.8.6-19 and laternot affected · rpm
    • v1.0.0-479 and laternot affected · rpm
    • v5.8.6-7 and laternot affected · rpm
    • v0.4.0-247 and laternot affected · rpm
    • v5.8.6-5 and laternot affected · rpm
    • v1.1.0-227 and laternot affected · rpm
    • v5.8.1-470 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernelbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-corebefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-cross-headersbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-debugbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-debug-corebefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-debug-develbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-develbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-docbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-modulesbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-modules-extrabefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-toolsbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-tools-libsbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-tools-libs-develbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-zfcpdumpbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-zfcpdump-corebefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-zfcpdump-develbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-zfcpdump-modulesbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8kernel-zfcpdump-modules-extrabefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8perfbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9
AlmaLinux:8python3-perfbefore 4.18.0-513.18.1.el8_94.18.0-513.18.1.el8_9

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

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    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
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    77This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:bpftool4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-513.18.1.el8_9 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.76-1 · Debian:12Package registry (OSV)
opensuse:kernel-rt5.14.21-150500.13.35.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-rt_debug5.14.21-150500.13.35.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-source-rt5.14.21-150500.13.35.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-syms-rt5.14.21-150500.13.35.1 · openSUSE:Leap 15.5Package registry (OSV)
red hat:bpftool-debuginfo0:7.0.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-284.52.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
rocky linux:kernel0:5.14.0-362.24.1.el9_3.cloud.0.6 · Rocky Linux:9Package registry (OSV)

+12

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (12 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records