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Linux Distros Unpatched Vulnerability : CVE-2026-6507

high Nessus Plugin ID 307348

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 dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS). (CVE-2026-6507)

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

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-6507

Plugin Details

Severity: High

ID: 307348

File Name: unpatched_CVE_2026_6507.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 4/17/2026

Updated: 4/17/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

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-2026-6507

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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:centos:centos:8, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:centos:centos:dnsmasq, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:9, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:dnsmasq, p-cpe:/a:centos:centos:dnsmasq-utils, p-cpe:/a:redhat:enterprise_linux:dnsmasq-utils, cpe:/o:redhat:enterprise_linux:6

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: 4/17/2026

Reference Information

CVE: CVE-2026-6507