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Amazon Linux 2 : xorg-x11-server, --advisory ALAS2-2026-3268 (ALAS-2026-3268)
critical Nessus Plugin ID 311212
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3268 advisory.XKB Integer Underflow in XkbSetCompatMap() (CVE-2026-33999)
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 'yum update xorg-x11-server' or or 'yum update --advisory ALAS2-2026-3268' to update your system.See Also
https://alas.aws.amazon.com//AL2/ALAS2-2026-3268.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-2026-34001.html
Plugin Details
Severity: Critical
ID: 311212
File Name: al2_ALAS-2026-3268.nasl
Version: 1.2
Type: Local
Agent: unix
Published: 4/30/2026
Updated: 5/8/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, 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: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:xorg-x11-server-xdmx, p-cpe:/a:amazon:linux:xorg-x11-server-xephyr, p-cpe:/a:amazon:linux:xorg-x11-server-xnest, p-cpe:/a:amazon:linux:xorg-x11-server-xorg, p-cpe:/a:amazon:linux:xorg-x11-server-xvfb, p-cpe:/a:amazon:linux:xorg-x11-server-xwayland, p-cpe:/a:amazon:linux:xorg-x11-server-common, p-cpe:/a:amazon:linux:xorg-x11-server-debuginfo, p-cpe:/a:amazon:linux:xorg-x11-server-devel, p-cpe:/a:amazon:linux:xorg-x11-server-source
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-2026-34001, CVE-2026-34002, CVE-2026-34003