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Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2026-128 (ALASKERNEL-5.4-2026-128)

high Nessus Plugin ID 337220

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Synopsis

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

Description

The version of kernel installed on the remote host is prior to 5.4.302-224.477. It is, therefore, affected by a vulnerability as referenced in the ALAS2KERNEL-5.4-2026-128 advisory.

 In the Linux kernel, the following vulnerability has been resolved:

 smb: client: mask server-provided mode to 07777 in modefromsid (CVE-2026-64379)

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 kernel' or or 'yum update --advisory ALAS2KERNEL-5.4-2026-128' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2KERNEL-5.4-2026-128.html

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

https://explore.alas.aws.amazon.com/CVE-2026-64379.html

Plugin Details

Severity: High

ID: 337220

File Name: al2_ALASKERNEL-5_4-2026-128.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/18/2026

Updated: 8/18/2026

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: Low

Score: 3.5

Percentile: 51.87

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-64379

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:bpftool-debuginfo, p-cpe:/a:amazon:linux:bpftool, p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:kernel-headers, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:python-perf-debuginfo, p-cpe:/a:amazon:linux:python-perf

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/17/2026

Vulnerability Publication Date: 7/23/2026

Reference Information

CVE: CVE-2026-64379