RHSA-2026:98487: Important: xorg-x11-server security update
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-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: 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
redhat/xorg-x11-serverto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9 - Upgrade
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redhat/xorg-x11-server-commonto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9 - Upgrade
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redhat/xorg-x11-server-debuginfoto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9 - Upgrade
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redhat/xorg-x11-server-debugsourceto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9 - Upgrade
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redhat/xorg-x11-server-commonto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9.aa - Upgrade
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redhat/xorg-x11-server-debuginfoto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9.aa - Upgrade
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redhat/xorg-x11-server-debugsourceto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9.aa - Upgrade
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redhat/xorg-x11-server-develto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9 - Upgrade
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redhat/xorg-x11-server-sourceto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9 - Upgrade
Upgrade
redhat/xorg-x11-server-develto a version that resolves this vulnerability.Fixed in 1.20.11-39.el9_9.aa
Event History
Frequently Asked Questions
Which package variants are covered by this advisory?
The advisory lists xorg-x11-server, xorg-x11-server-common, xorg-x11-server-devel, xorg-x11-server-source, xorg-x11-server-debuginfo, xorg-x11-server-debugsource, and xorg-x11-server-debugsource.
Does the update include an Xwayland-specific security fix?
Yes. CVE-2026-88812 affects xwayland and is described as arbitrary code execution through a double-free in XKB geometry handling.
Which listed issue is identified as a privilege-escalation vulnerability?
CVE-2026-93521 is described as privilege escalation through crafted RandR provider property requests.