EulerOS 2.0 SP15 : dnsmasq (EulerOS-SA-2026-2880)

high Nessus Plugin ID 332816

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

According to the versions of the dnsmasq packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.(CVE-2026-4892)

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.(CVE-2026-2291)

A buffer overflow in dnsmasq's extract_addresses() function allows an attacker to trigger a heap out-of- bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record's end.(CVE-2026-5172)

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.(CVE-2026-4893)

Tenable has extracted the preceding description block directly from the EulerOS dnsmasq security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected dnsmasq packages.

Plugin Details

Severity: High

ID: 332816

File Name: EulerOS_SA-2026-2880.nasl

Version: 1.1

Type: Local

Family: Huawei Local Security Checks

Published: 8/6/2026

Updated: 8/6/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

Percentile: 96.27

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-2291

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2026-4892

Vulnerability Information

CPE: cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:dnsmasq-help, p-cpe:/a:huawei:euleros:dnsmasq

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/6/2026

Vulnerability Publication Date: 5/11/2026

Reference Information

CVE: CVE-2026-2291, CVE-2026-4892, CVE-2026-4893, CVE-2026-5172

IAVA: 2026-A-0450

Detections

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