- Issued:
- 2026-08-11
- Updated:
- 2026-08-11
RHSA-2026:53450 - Security Advisory
Synopsis
Important: xorg-x11-server-Xwayland security update
Type/Severity
Security Advisory: Important
Red Hat Lightspeed patch analysis
Identify and remediate systems affected by this advisory.
Topic
An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
Xwayland is an X server for running X clients under Wayland.
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.
Solution
For details on how to apply this update, which includes the changes described in this advisory, refer to:
Affected Products
- Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.6 x86_64
- Red Hat Enterprise Linux Server - AUS 8.6 x86_64
Fixes
- BZ - 2496165 - CVE-2026-55999 xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow
CVEs
Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.6
| SRPM | |
|---|---|
| xorg-x11-server-Xwayland-21.1.3-2.el8_6.8.src.rpm | SHA-256: 802ce6c6b2440047270422d9b690e485a075c3c03fff3bad991b1fba94696181 |
| x86_64 | |
| xorg-x11-server-Xwayland-21.1.3-2.el8_6.8.x86_64.rpm | SHA-256: dee7d2565a02578b82e5cce748f22dff19eb354b971063f58ebb8a57855844ec |
| xorg-x11-server-Xwayland-debuginfo-21.1.3-2.el8_6.8.x86_64.rpm | SHA-256: c0c639c2af2b42cb4a2fd9da1de91f1af8c1acb91658d5af7f9af8d1d234200c |
| xorg-x11-server-Xwayland-debugsource-21.1.3-2.el8_6.8.x86_64.rpm | SHA-256: 12feed338623f790e1bc55bc40c0b7e7848afc445230f1779773f67945ce715c |
Red Hat Enterprise Linux Server - AUS 8.6
| SRPM | |
|---|---|
| xorg-x11-server-Xwayland-21.1.3-2.el8_6.8.src.rpm | SHA-256: 802ce6c6b2440047270422d9b690e485a075c3c03fff3bad991b1fba94696181 |
| x86_64 | |
| xorg-x11-server-Xwayland-21.1.3-2.el8_6.8.x86_64.rpm | SHA-256: dee7d2565a02578b82e5cce748f22dff19eb354b971063f58ebb8a57855844ec |
| xorg-x11-server-Xwayland-debuginfo-21.1.3-2.el8_6.8.x86_64.rpm | SHA-256: c0c639c2af2b42cb4a2fd9da1de91f1af8c1acb91658d5af7f9af8d1d234200c |
| xorg-x11-server-Xwayland-debugsource-21.1.3-2.el8_6.8.x86_64.rpm | SHA-256: 12feed338623f790e1bc55bc40c0b7e7848afc445230f1779773f67945ce715c |
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/