CentOS Linux 8.4 [TuxCare] Security Update: corosync / corosync-vqsim / corosynclib / corosynclib-devel / etc Multiple Vulnerabilities (CENTOS8.4:CLSA-2026:1792591710)

critical Nessus Plugin ID 369964

Synopsis

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

Description

The CentOS Linux 8.4 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.4:CLSA-2026:1792591710 advisory.

- Corosync through 3.1.9, if encryption is disabled or the attacker knows the encryption key, has a stack- based buffer overflow in orf_token_endian_convert in exec/totemsrp.c via a large UDP packet.
(CVE-2025-30472)

- A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents (CVE-2026-35091)

- A flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation allows a remote, unauthenticated attacker to send crafted User Datagram Protocol (UDP) packets.
This can cause the service to crash, leading to a denial of service. This vulnerability specifically affects Corosync deployments configured to use totemudp/totemudpu mode. (CVE-2026-35092)

- 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 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 TuxCare advisory CENTOS8.4:CLSA-2026:1792591710.

Plugin Details

Severity: Critical

ID: 369964

File Name: tuxcare_centos_8.4_CLSA-2026-1792591710.nasl

Version: 1.1

Type: Local

Agent: unix

Family: CentOS Local Security Checks

Published: 10/21/2026

Updated: 10/21/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS Score Source: CVE-2025-30472

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

Vulnerability Information

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/21/2026

Vulnerability Publication Date: 3/22/2025

Reference Information

CVE: CVE-2025-30472, CVE-2026-35091, CVE-2026-35092, CVE-2026-81665

CLSA: 2026:1792591710

Detections

Analytics