RockyLinux 9 : dnsmasq (RLSA-2026:19373)

high Nessus Plugin ID 317980

Synopsis

The remote RockyLinux host is missing one or more security updates.

Description

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:19373 advisory.

* dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)

* dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)

* dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)

* dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)

* dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

Tenable has extracted the preceding description block directly from the RockyLinux 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 packages.

Plugin Details

Severity: High

ID: 317980

File Name: rocky_linux_RLSA-2026-19373.nasl

Version: 1.1

Type: Local

Family: Rocky Linux Local Security Checks

Published: 5/29/2026

Updated: 5/29/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 8.3

Temporal Score: 6.5

Vector: CVSS2#AV:A/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: 7.6

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:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:rocky:linux:dnsmasq, p-cpe:/a:rocky:linux:dnsmasq-debugsource, p-cpe:/a:rocky:linux:dnsmasq-utils, p-cpe:/a:rocky:linux:dnsmasq-debuginfo, cpe:/o:rocky:linux:9, p-cpe:/a:rocky:linux:dnsmasq-utils-debuginfo

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 5/11/2026

Reference Information

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

Detections

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