Detections
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Amazon Linux 2 : corosync, --advisory ALAS2-2026-3811 (ALAS-2026-3811)

critical Nessus Plugin ID 328844

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of corosync installed on the remote host is prior to 2.4.3-6. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3811 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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update corosync' or or 'yum update --advisory ALAS2-2026-3811' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3811.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2025-30472.html

Plugin Details

Severity: Critical

ID: 328844

File Name: al2_ALAS-2026-3811.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/21/2026

Updated: 7/21/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

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

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:corosync-debuginfo, p-cpe:/a:amazon:linux:corosync-qdevice, p-cpe:/a:amazon:linux:corosync-qnetd, p-cpe:/a:amazon:linux:corosync, p-cpe:/a:amazon:linux:corosynclib-devel, p-cpe:/a:amazon:linux:corosynclib, p-cpe:/a:amazon:linux:spausedd

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/20/2026

Vulnerability Publication Date: 3/22/2025

Reference Information

CVE: CVE-2025-30472

IAVA: 2026-A-0004