RLSA-2026:98476: Important: xorg-x11-server-Xwayland security update
Xwayland is an X server for running X clients under Wayland.
Security Fix(es):
xorg-x11-server: xorg-x11-server: Arbitrary code execution via use-after-free in passive grab handling (CVE-2026-93516)
xorg-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests (CVE-2026-93521)
xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling (CVE-2026-88812)
xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice (CVE-2026-93523)
xorg-x11-server: glamor: size tmpbits buffer for source coordinate range in uploadboxes (CVE-2026-93522)
xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer overflow (CVE-2026-93517)
xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard mapping resize (CVE-2026-93518)
xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in inputconstraincursor() (CVE-2026-93519)
xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode handling (CVE-2026-93520)
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
rocky-linux/xorg-x11-server-Xwaylandto a version that resolves this vulnerability.Fixed in 0:24.1.9-7.el9_9.1 - Upgrade
Upgrade
rocky-linux/xorg-x11-server-Xwayland-debuginfoto a version that resolves this vulnerability.Fixed in 0:24.1.9-7.el9_9.1 - Upgrade
Upgrade
rocky-linux/xorg-x11-server-Xwayland-debugsourceto a version that resolves this vulnerability.Fixed in 0:24.1.9-7.el9_9.1 - Upgrade
Upgrade
rocky-linux/xorg-x11-server-Xwayland-develto a version that resolves this vulnerability.Fixed in 0:24.1.9-7.el9_9.1
Event History
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
Who is exposed to these issues?
Systems running the listed Rocky Linux xorg-x11-server-xwayland packages are in scope. The affected component provides an X server for running X clients under Wayland.
What level of access does an attacker need?
The supplied severity vector indicates local access and low privileges are required, with no user interaction required. Successful exploitation can affect confidentiality, integrity, and availability.
What are the potential impacts?
The update addresses multiple arbitrary-code-execution issues, a privilege-escalation issue, and memory-safety flaws including buffer overflows, out-of-bounds writes, use-after-free, and double-free conditions.