Linux Distros Unpatched Vulnerability : CVE-2026-81665

critical Nessus Plugin ID 342802

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 heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly.
When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control. (CVE-2026-81665)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: Critical

ID: 342802

File Name: unpatched_CVE_2026_81665.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 9/4/2026

Updated: 9/4/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.4

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

CVSS Score Source: CVE-2026-81665

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9

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

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

Vulnerability Information

CPE: cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:corosync-qdevice, p-cpe:/a:centos:centos:corosync-qnetd, p-cpe:/a:centos:centos:corosync-vqsim, p-cpe:/a:centos:centos:corosync, p-cpe:/a:centos:centos:corosynclib-devel, p-cpe:/a:centos:centos:corosynclib, p-cpe:/a:centos:centos:spausedd, p-cpe:/a:redhat:enterprise_linux:corosync-qdevice, p-cpe:/a:redhat:enterprise_linux:corosync-qnetd, p-cpe:/a:redhat:enterprise_linux:corosync-vqsim, p-cpe:/a:redhat:enterprise_linux:corosync, p-cpe:/a:redhat:enterprise_linux:corosynclib-devel, p-cpe:/a:redhat:enterprise_linux:corosynclib, p-cpe:/a:redhat:enterprise_linux:spausedd

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: 9/4/2026

Reference Information

CVE: CVE-2026-81665

Detections

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