Debian dsa-6264 : dnsmasq - security update

high Nessus Plugin ID 314276

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6264 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6264-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff May 11, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : dnsmasq CVE ID : CVE-2026-2291 CVE-2026-4890 CVE-2026-4891 CVE-2026-4892 CVE-2026-4893 CVE-2026-5172

Multiple security vulnerabilities have been discovered in Dnsmasq, a lightweight DNS forwarder and DHCP server, which could result in cache poisoning, bypass of security controls, denial of service or local privilege escalation.

For the oldstable distribution (bookworm), these problems have been fixed in version 2.90-4~deb12u2.

For the stable distribution (trixie), these problems have been fixed in version 2.91-1+deb13u1.

We recommend that you upgrade your dnsmasq packages.

For the detailed security status of dnsmasq please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/dnsmasq

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the dnsmasq packages.

Plugin Details

Severity: High

ID: 314276

File Name: debian_DSA-6264.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 5/11/2026

Updated: 5/11/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-4892

CVSS v3

Risk Factor: High

Base Score: 8.4

Temporal Score: 7.3

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:dnsmasq, p-cpe:/a:debian:debian_linux:dnsmasq-base, p-cpe:/a:debian:debian_linux:dnsmasq-utils, p-cpe:/a:debian:debian_linux:dnsmasq-base-lua, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 5/11/2026

Vulnerability Publication Date: 5/11/2026

Reference Information

CVE: CVE-2026-2291, CVE-2026-4890, CVE-2026-4891, CVE-2026-4892, CVE-2026-4893, CVE-2026-5172

Detections

Analytics