ALAS2-2026-3268

Amazon Linux 2 Security Advisory: ALAS2-2026-3268
Advisory Released Date: 2026-04-30
Advisory Updated Date: 2026-04-30

Severity: Important

References: CVE-2026-33999 CVE-2026-34001 CVE-2026-34002 CVE-2026-34003
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

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)

Affected Packages:

xorg-x11-server

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update xorg-x11-server or yum update --advisory ALAS2-2026-3268 to update your system.

New Packages:

aarch64:
    xorg-x11-server-common-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-Xorg-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-Xnest-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-Xdmx-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-Xvfb-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-Xephyr-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-Xwayland-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-devel-1.20.4-22.amzn2.0.11.aarch64
    xorg-x11-server-debuginfo-1.20.4-22.amzn2.0.11.aarch64

i686:
    xorg-x11-server-common-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-Xorg-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-Xnest-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-Xdmx-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-Xvfb-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-Xephyr-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-Xwayland-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-devel-1.20.4-22.amzn2.0.11.i686
    xorg-x11-server-debuginfo-1.20.4-22.amzn2.0.11.i686

noarch:
    xorg-x11-server-source-1.20.4-22.amzn2.0.11.noarch

src:
    xorg-x11-server-1.20.4-22.amzn2.0.11.src

x86_64:
    xorg-x11-server-common-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-Xorg-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-Xnest-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-Xdmx-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-Xvfb-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-Xephyr-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-Xwayland-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-devel-1.20.4-22.amzn2.0.11.x86_64
    xorg-x11-server-debuginfo-1.20.4-22.amzn2.0.11.x86_64

Additional References

Release Notes: Amazon Linux 2 Release Notes

Red Hat: CVE-2026-33999, CVE-2026-34001, CVE-2026-34002, CVE-2026-34003

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