Rocky Linux 10.2 [CIQ] Security Update: dnsmasq / dnsmasq-debuginfo / dnsmasq-debugsource / dnsmasq-utils / etc Multiple Vulnerabilities (crlsa-2026_19158)

high Nessus Plugin ID 356785

Synopsis

The Rocky Linux host is missing one or more security updates.

Description

The Rocky Linux 10.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_19158 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)

* dnsmasq: extract_addresses() OOB read via malformed rdlen (CVE-2026-5172)

Tenable has extracted the preceding description block directly from the CIQ 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 based on the guidance in CIQ advisory crlsa-2026_19158.

Plugin Details

Severity: High

ID: 356785

File Name: ciq_rocky_linux_10_2_crlsa-2026_19158.nasl

Version: 1.1

Type: Local

Family: Rocky Linux Local Security Checks

Published: 10/1/2026

Updated: 10/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.2

Vendor

Vendor Severity: Unknown

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

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RockyLinux/release, Host/RockyLinux/rpm-list, Host/OS/extended-third-party

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/29/2026

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