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Fencer Vulns
medium 6.5

CVE-2023-3338 json

Crash due to a null pointer dereference in the dn_nsp_send function

published 2023-06-30 3 y ago modified 2026-10-14 25 d ago also EUVD-2023-44006

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
8.5%
EPSS 8.5% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

A null pointer dereference flaw was found in the Linux kernel's DECnet networking protocol. This issue could allow a remote user to crash the system.

Patch / fix

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1
  • linux Debian 14, Debian 13, Debian 12 6.1.4-1

debian advisories DEBIAN-CVE-2023-3338

  • linux Ubuntu 20.04 LTS 5.4.0-164.181
  • linux Ubuntu 22.04 LTS 5.15.0-86.96
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1111.120
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1047.52
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1115.124
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1044.52
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1044.49
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1058.63

ubuntu advisories UBUNTU-CVE-2023-3338

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • hyperv-daemons CBL-Mariner 2.0 5.15.158.1-1
  • kernel CBL-Mariner 2.0 5.15.137.1-1
  • hyperv-daemons Azure Linux 3.0 6.6.35.1-1

azure linux advisories AZL-27636AZL-31687AZL-34801

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-3338 updated cvss 6.5

kernel: DECnet: crash due to a NULL pointer dereference in the dn_nsp_send function

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-166-11 updated cvss 6.5

Siemens SIMATIC S7-1500 TM MFP Linux Kernel

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

8.48% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • seclists.org https://seclists.org/oss-sec/2023/q2/276 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a kernel
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Fedora Fedora
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.