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Amazon Linux 2023 : xorg-x11-server-common, xorg-x11-server-devel, xorg-x11-server-source (ALAS2023-2026-1614)

critical Nessus Plugin ID 311303

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1614 advisory.

 XKB Integer Underflow in XkbSetCompatMap() (CVE-2026-33999)

 XKB Out-of-bounds Read in CheckSetGeom() (CVE-2026-34000)

 XSYNC Use-after-free in miSyncTriggerFence() (CVE-2026-34001)

 XKB Out-of-bounds read in CheckModifierMap() (CVE-2026-34002)

 XKB Buffer overflow in CheckKeyTypes() (CVE-2026-34003)

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 'dnf update xorg-x11-server --releasever 2023.11.20260427' or or 'dnf update --advisory ALAS2023-2026-1614 --releasever 2023.11.20260427' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1614.html

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

https://explore.alas.aws.amazon.com/CVE-2026-33999.html

https://explore.alas.aws.amazon.com/CVE-2026-34000.html

https://explore.alas.aws.amazon.com/CVE-2026-34001.html

https://explore.alas.aws.amazon.com/CVE-2026-34002.html

https://explore.alas.aws.amazon.com/CVE-2026-34003.html

Plugin Details

Severity: Critical

ID: 311303

File Name: al2023_ALAS2023-2026-1614.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 4/30/2026

Updated: 5/8/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-34002

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:xorg-x11-server-xephyr, p-cpe:/a:amazon:linux:xorg-x11-server-xvfb-debuginfo, p-cpe:/a:amazon:linux:xorg-x11-server-debuginfo, p-cpe:/a:amazon:linux:xorg-x11-server-xephyr-debuginfo, p-cpe:/a:amazon:linux:xorg-x11-server-common, p-cpe:/a:amazon:linux:xorg-x11-server-devel, p-cpe:/a:amazon:linux:xorg-x11-server-xnest-debuginfo, p-cpe:/a:amazon:linux:xorg-x11-server-source, p-cpe:/a:amazon:linux:xorg-x11-server-debugsource, p-cpe:/a:amazon:linux:xorg-x11-server-xvfb, p-cpe:/a:amazon:linux:xorg-x11-server-xnest, p-cpe:/a:amazon:linux:xorg-x11-server-xorg, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:xorg-x11-server-xorg-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: 4/30/2026

Vulnerability Publication Date: 4/14/2026

Reference Information

CVE: CVE-2026-33999, CVE-2026-34000, CVE-2026-34001, CVE-2026-34002, CVE-2026-34003