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Amazon Linux 2 : microcode_ctl, --advisory ALAS2-2025-3014 (ALAS-2025-3014)

high Nessus Plugin ID 266153

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 multiple vulnerabilities as referenced in the ALAS2-2025-3014 advisory.

 Insufficient granularity of access control in the OOB-MSM for some Intel(R) Xeon(R) 6 Scalable processors may allow a privileged user to potentially enable escalation of privilege via adjacent access.
 (CVE-2025-22839)

 Sequence of processor instructions leads to unexpected behavior for some Intel(R) Xeon(R) 6 Scalable processors may allow an authenticated user to potentially enable escalation of privilege via local access (CVE-2025-22840)

 Improper handling of overlap between protected memory ranges for some Intel(R) Xeon(R) 6 processor with Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access.
 (CVE-2025-22889)

 Out-of-bounds write in the memory subsystem for some Intel(R) Xeon(R) 6 processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access. (CVE-2025-26403)

 Improperly implemented security check for standard in the DDRIO configuration for some Intel(R) Xeon(R) 6 Processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access. (CVE-2025-32086)

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

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

Solution

Run 'yum update microcode_ctl' or or 'yum update --advisory ALAS2-2025-3014' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2025-3014.html

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

https://explore.alas.aws.amazon.com/CVE-2025-22839.html

https://explore.alas.aws.amazon.com/CVE-2025-22840.html

https://explore.alas.aws.amazon.com/CVE-2025-22889.html

https://explore.alas.aws.amazon.com/CVE-2025-26403.html

https://explore.alas.aws.amazon.com/CVE-2025-32086.html

Plugin Details

Severity: High

ID: 266153

File Name: al2_ALAS-2025-3014.nasl

Version: 1.1

Type: local

Agent: unix

Published: 9/30/2025

Updated: 9/30/2025

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 4.4

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

CVSS Score Source: CVE-2025-22889

CVSS v3

Risk Factor: High

Base Score: 7.9

Temporal Score: 6.9

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

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

CVSS v4

Risk Factor: High

Base Score: 7.3

Threat Score: 4.2

Threat Vector: CVSS:4.0/E:U

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

CVSS Score Source: CVE-2025-22839

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: 9/29/2025

Vulnerability Publication Date: 8/12/2025

Reference Information

CVE: CVE-2025-22839, CVE-2025-22840, CVE-2025-22889, CVE-2025-26403, CVE-2025-32086