RLSA-2026:98581: 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.el10_3.1 - Upgrade
Upgrade
rocky-linux/xorg-x11-server-Xwayland-debuginfoto a version that resolves this vulnerability.Fixed in 0:24.1.9-7.el10_3.1 - Upgrade
Upgrade
rocky-linux/xorg-x11-server-Xwayland-develto a version that resolves this vulnerability.Fixed in 0:24.1.9-7.el10_3.1 - Upgrade
Upgrade
rocky-linux/xorg-x11-server-Xwayland-debugsourceto a version that resolves this vulnerability.Fixed in 0:24.1.9-7.el10_3.1
Event History
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
Who is most directly exposed to these issues?
Systems running the Rocky Linux xorg-x11-server-xwayland packages are directly in scope, including the listed debuginfo, devel, and debugsource package variants. The advisory concerns Xwayland, which runs X clients under Wayland.
What level of access does an attacker need?
The provided severity vector indicates local attack access, low attack complexity, low privileges required, and no user interaction. Several listed fixes involve arbitrary code execution, while one addresses privilege escalation.
Are the affected flaws limited to one vulnerability type?
No. The fixes include use-after-free, double-free, buffer overflow, heap-based buffer overflow, out-of-bounds write, integer truncation, and crafted RandR provider property request issues. The listed CWEs are Buffer Overflow and Use After Free.