Linux Distros Unpatched Vulnerability : CVE-2026-18103

medium Nessus Plugin ID 332066

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention. (CVE-2026-18103)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: Medium

ID: 332066

File Name: unpatched_CVE_2026_18103.nasl

Version: 1.4

Type: Local

Agent: unix

Family: Misc.

Published: 8/4/2026

Updated: 8/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-18103

CVSS v3

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.5

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:isc-dhcp, p-cpe:/a:centos:centos:dhclient, p-cpe:/a:centos:centos:dhcp-client, p-cpe:/a:centos:centos:dhcp-common, p-cpe:/a:centos:centos:dhcp-devel, p-cpe:/a:centos:centos:dhcp-libs, p-cpe:/a:centos:centos:dhcp-relay, p-cpe:/a:centos:centos:dhcp-server, p-cpe:/a:centos:centos:dhcp, p-cpe:/a:debian:debian_linux:isc-dhcp, p-cpe:/a:redhat:enterprise_linux:dhclient, p-cpe:/a:redhat:enterprise_linux:dhcp-client, p-cpe:/a:redhat:enterprise_linux:dhcp-common, p-cpe:/a:redhat:enterprise_linux:dhcp-devel, p-cpe:/a:redhat:enterprise_linux:dhcp-libs, p-cpe:/a:redhat:enterprise_linux:dhcp-relay, p-cpe:/a:redhat:enterprise_linux:dhcp-server, p-cpe:/a:redhat:enterprise_linux:dhcp

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/5/2026

Reference Information

CVE: CVE-2026-18103

Detections

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