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RLSA-2026:38486

Security Mirrored from RHSA-2026:38486
Issued at: 2026-07-14
Updated at: 2026-07-14

Synopsis

Important: xorg-x11-server security update



Description

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.

Security Fix(es):

* xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow (CVE-2026-55999)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.



Affected products

Rocky Linux 9 aarch64 Rocky Linux 9 ppc64le Rocky Linux 9 s390x Rocky Linux 9 x86_64

Fixes

2496165

CVEs

CVE-2026-55999

Affected packages

Rocky Linux 9 x86_64 - AppStream

xorg-x11-server-0:1.20.11-34.el9_8.3.src.rpm xorg-x11-server-common-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-debugsource-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xnest-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xorg-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.3.x86_64.rpm

Rocky Linux 9 aarch64 - AppStream

xorg-x11-server-0:1.20.11-34.el9_8.3.src.rpm xorg-x11-server-common-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-debugsource-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xnest-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xorg-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.3.aarch64.rpm

Rocky Linux 9 s390x - AppStream

xorg-x11-server-0:1.20.11-34.el9_8.3.src.rpm xorg-x11-server-common-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-debugsource-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xnest-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xorg-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.3.s390x.rpm

Rocky Linux 9 ppc64le - AppStream

xorg-x11-server-0:1.20.11-34.el9_8.3.src.rpm xorg-x11-server-common-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-debuginfo-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-debugsource-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xdmx-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xdmx-debuginfo-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xephyr-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xephyr-debuginfo-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xnest-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xnest-debuginfo-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xorg-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xorg-debuginfo-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xvfb-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-Xvfb-debuginfo-0:1.20.11-34.el9_8.3.ppc64le.rpm

Rocky Linux 9 x86_64 - CRB

xorg-x11-server-debugsource-0:1.20.11-34.el9_8.3.i686.rpm xorg-x11-server-devel-0:1.20.11-34.el9_8.3.i686.rpm xorg-x11-server-devel-0:1.20.11-34.el9_8.3.x86_64.rpm xorg-x11-server-source-0:1.20.11-34.el9_8.3.noarch.rpm

Rocky Linux 9 aarch64 - CRB

xorg-x11-server-devel-0:1.20.11-34.el9_8.3.aarch64.rpm xorg-x11-server-source-0:1.20.11-34.el9_8.3.noarch.rpm

Rocky Linux 9 ppc64le - CRB

xorg-x11-server-devel-0:1.20.11-34.el9_8.3.ppc64le.rpm xorg-x11-server-source-0:1.20.11-34.el9_8.3.noarch.rpm

Rocky Linux 9 s390x - CRB

xorg-x11-server-devel-0:1.20.11-34.el9_8.3.s390x.rpm xorg-x11-server-source-0:1.20.11-34.el9_8.3.noarch.rpm