Amazon Linux 2 : cifs-utils (ALAS-2026-4032)

high Nessus Plugin ID 371806

Synopsis

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

Description

The version of cifs-utils installed on the remote host is prior to 6.2-10. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-4032 advisory.

A flaw was found in cifs-utils. This flaw allows an unprivileged local user to achieve privilege escalation. When a privileged service mounts a Common Internet File System (CIFS) share using a user- controlled credentials file, input values are not properly sanitized before being assembled into mount options. A local attacker can exploit this vulnerability to inject unauthorized mount options, allowing them to bypass permission checks and execute files with administrative (root) privileges.
(CVE-2026-104715)

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 cifs-utils' or or 'yum update --advisory ALAS2-2026-4032' to update your system.

Plugin Details

Severity: High

ID: 371806

File Name: al2_ALAS-2026-4032.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/24/2026

Updated: 10/24/2026

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: 6.9

Percentile: 96.41

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-104715

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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:cifs-utils-debuginfo, p-cpe:/a:amazon:linux:cifs-utils-devel, p-cpe:/a:amazon:linux:cifs-utils

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: 10/24/2026

Vulnerability Publication Date: 10/16/2026

Reference Information

CVE: CVE-2026-104715

IAVB: 2026-B-0298

Detections

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