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Amazon Linux 2 : microcode_ctl, --advisory ALAS2-2026-3294 (ALAS-2026-3294)

low Nessus Plugin ID 314556

Synopsis

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

Description

The version of microcode_ctl installed on the remote host is prior to 2.1-47. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3294 advisory.

 Improper handling of values in the microcode flow for some Intel(R) Processor Family may allow an escalation of privilege. Startup code and smm adversary with a privileged user combined with a high complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present with special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (low) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (low), integrity (low) and availability (none) impacts. (CVE-2025-31648)

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 microcode_ctl' or or 'yum update --advisory ALAS2-2026-3294' to update your system.

See Also

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

https://explore.alas.aws.amazon.com/CVE-2025-31648.html

https://alas.aws.amazon.com//AL2/ALAS2-2026-3294.html

Plugin Details

Severity: Low

ID: 314556

File Name: al2_ALAS-2026-3294.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/14/2026

Updated: 5/14/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.0

CVSS v2

Risk Factor: Low

Base Score: 2.3

Temporal Score: 1.7

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

CVSS Score Source: CVE-2025-31648

CVSS v3

Risk Factor: Low

Base Score: 3.9

Temporal Score: 3.4

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

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

CVSS v4

Risk Factor: Low

Base Score: 1.8

Threat Score: 0.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:microcode_ctl, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:microcode_ctl-debuginfo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/14/2026

Vulnerability Publication Date: 2/10/2026

Reference Information

CVE: CVE-2025-31648