RHSA-2026:49515: Important: xorg-x11-server security update

Published Aug 3, 2026
·
Updated

Important: xorg-x11-server security update

Other sources

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.

— Red Hat

Affected Software

22 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux Server - AUS
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for IBM z Systems - 4 years of updates
redhat/xorg-x11-server<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-common<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-debuginfo<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-debugsource<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-common<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-debuginfo<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-debugsource<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-common<1.20.11-21.el9_2.1.aa
1.20.11-21.el9_2.1.aa
redhat/xorg-x11-server-debuginfo<1.20.11-21.el9_2.1.aa
1.20.11-21.el9_2.1.aa
redhat/xorg-x11-server-debugsource<1.20.11-21.el9_2.1.aa
1.20.11-21.el9_2.1.aa
redhat/xorg-x11-server-common<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-debuginfo<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1
redhat/xorg-x11-server-debugsource<1.20.11-21.el9_2.1
1.20.11-21.el9_2.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/xorg-x11-server to a version that resolves this vulnerability.

    Fixed in 1.20.11-21.el9_2.1
  2. Upgrade

    Upgrade redhat/xorg-x11-server-common to a version that resolves this vulnerability.

    Fixed in 1.20.11-21.el9_2.1
  3. Upgrade

    Upgrade redhat/xorg-x11-server-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.20.11-21.el9_2.1
  4. Upgrade

    Upgrade redhat/xorg-x11-server-debugsource to a version that resolves this vulnerability.

    Fixed in 1.20.11-21.el9_2.1
  5. Upgrade

    Upgrade redhat/xorg-x11-server-common to a version that resolves this vulnerability.

    Fixed in 1.20.11-21.el9_2.1.aa
  6. Upgrade

    Upgrade redhat/xorg-x11-server-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.20.11-21.el9_2.1.aa
  7. Upgrade

    Upgrade redhat/xorg-x11-server-debugsource to a version that resolves this vulnerability.

    Fixed in 1.20.11-21.el9_2.1.aa

Event History

Aug 3, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·12:56 AM
Data Sourced
via Red Hat·12:56 AM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:49515?

The severity of RHSA-2026:49515 is categorized as high with a score of 7.

2

What vulnerabilities does RHSA-2026:49515 address?

RHSA-2026:49515 addresses security vulnerabilities found in the xorg-x11-server.

3

How do I fix RHSA-2026:49515?

To fix RHSA-2026:49515, you should apply the latest security update for xorg-x11-server provided by Red Hat.

4

Which Red Hat systems are affected by RHSA-2026:49515?

RHSA-2026:49515 affects multiple Red Hat Enterprise Linux versions, including Power, ARM 64, and x86_64 systems.

5

When was RHSA-2026:49515 published?

RHSA-2026:49515 was published on August 3, 2026.

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