CVE-2023-3338: Crash due to a null pointer dereference in the dn_nsp_send function

Modified

AliasesUBUNTU-CVE-2023-3338DEBIAN-CVE-2023-3338

Published 30-06-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-3338 is a medium (CVSS 6.5) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 8.48% chance of exploitation in the next 30 days, higher than 95% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Routine

Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

6.5/10

010

Medium · v3.1 (CVE.org)

EPSS score

8.48%

0%100%

Low · +0.45 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 11 · Related 6

DLA-3508-1 DLA-3623-1 DSA-5480-1 MGASA-2023-0237 MGASA-2023-0238 USN-6416-1+5 more

Timeline

30-06-2023
PublishedVulnerability first disclosed.
14-10-2026
Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

v3.16.5

EPSS trend

Probability

8.48%

Chance of exploitation in the next 30 days

Percentile

95%

Versus all other CVEs

30-day change

Increase +0.45 pp

From 8.03% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found

referenceUnverified
Exploit Reference (seclists.org)
Maturity: unknown

Weaknesses

CWE · root cause

CWE-476NULL Pointer DereferenceThe product dereferences a pointer that it expects to be valid but is NULL.

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu98 products

linuxAll versions (No fix recorded) | < 5.4.0-164.181 | < 5.15.0-86.96
linux-allwinner-5.19All versions (No fix recorded)
linux-awsAll versions (No fix recorded) | < 5.4.0-1111.120 | < 5.15.0-1047.52
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)

linux-aws-5.13All versions (No fix recorded)
linux-aws-5.15< 5.15.0-1047.52~20.04.1
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1111.120~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fipsAll versions (No fix recorded) | < 5.4.0-1111.120+fips1
linux-aws-hweAll versions (No fix recorded)
linux-azureAll versions (No fix recorded) | < 5.4.0-1117.124 | < 5.15.0-1049.56
linux-azure-4.15All versions (No fix recorded)
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1049.56~20.04.1
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1117.124~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 5.15.0-1049.56.1
linux-azure-fde-5.15< 5.15.0-1114.123~20.04.1
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fipsAll versions (No fix recorded) | < 5.4.0-1117.124+fips1
linux-bluefield< 5.4.0-1072.78 | < 5.15.0-1027.29
linux-fipsAll versions (No fix recorded) | < 5.4.0-1086.95
linux-gcpAll versions (No fix recorded) | < 5.4.0-1115.124 | < 5.15.0-1044.52
linux-gcp-4.15All versions (No fix recorded)
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1044.52~20.04.1
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1115.124~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fipsAll versions (No fix recorded) | < 5.4.0-1115.124+fips1
linux-gkeAll versions (No fix recorded) | < 5.15.0-1044.49
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15All versions (No fix recorded)
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.4.0-1078.82 | < 5.15.0-1030.35
linux-gkeop-5.15< 5.15.0-1030.35~20.04.1
linux-gkeop-5.4All versions (No fix recorded)
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-86.96~20.04.1
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-164.181~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1058.63 | < 5.15.0-1040.43
linux-ibm-5.15< 5.15.0-1040.43~20.04.1
linux-ibm-5.4< 5.4.0-1058.63~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtime< 5.15.0-1040.42
linux-intel-iotg< 5.15.0-1043.49
linux-intel-iotg-5.15< 5.15.0-1043.49~20.04.1
linux-iot< 5.4.0-1023.24
linux-kvmAll versions (No fix recorded) | < 5.4.0-1100.106 | < 5.15.0-1044.49
linux-lowlatency< 5.15.0-86.95
linux-lowlatency-hwe-5.15< 5.15.0-86.95~20.04.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lts-xenialAll versions (No fix recorded)
linux-nvidia< 5.15.0-1037.37
linux-nvidia-tegra< 5.15.0-1018.18
linux-nvidia-tegra-5.15< 5.15.0-1018.18~20.04.1
linux-nvidia-tegra-igx< 5.15.0-1005.5
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14All versions (No fix recorded)
linux-oem-5.17All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oem-6.0All versions (No fix recorded)
linux-oracleAll versions (No fix recorded) | < 5.4.0-1110.119 | < 5.15.0-1045.51
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15< 5.15.0-1045.51~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1110.119~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1095.106 | < 5.15.0-1040.43
linux-raspi-5.4< 5.4.0-1095.106~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1048.54
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1043.47~20.04.1
linux-riscv-5.19All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-starfive-5.19All versions (No fix recorded)
linux-xilinx-zynqmp< 5.4.0-1031.35 | < 5.15.0-1025.29