Summary
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: 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)
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.
Fixed packages 8
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | xorg-x11-server-common | 1.20.11-34.el9_8.4 |
| AlmaLinux · 9 | xorg-x11-server-devel | 1.20.11-34.el9_8.4 |
| AlmaLinux · 9 | xorg-x11-server-source | 1.20.11-34.el9_8.4 |
| AlmaLinux · 9 | xorg-x11-server-Xdmx | 1.20.11-34.el9_8.4 |
| AlmaLinux · 9 | xorg-x11-server-Xephyr | 1.20.11-34.el9_8.4 |
| AlmaLinux · 9 | xorg-x11-server-Xnest | 1.20.11-34.el9_8.4 |
| AlmaLinux · 9 | xorg-x11-server-Xorg | 1.20.11-34.el9_8.4 |
| AlmaLinux · 9 | xorg-x11-server-Xvfb | 1.20.11-34.el9_8.4 |
Vulnerabilities 3
-
High 7.8
X.Org Server XKB SetGeometry TextDoodad Double Free
A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially code in the x server context.
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High 7.8
X.Org Server RandR ChangeProviderProperty Heap Buffer Overflow
A buffer overflow in RandR ChangeProviderProperty requests in X.Org X Server before 2.1.25 and XWayland before 24.4.14 could be used by authenticated X clients to crash or execute code within the X server context.
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High 7.8
X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write
A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.
References
-
report
https://access.redhat.com/security/cve/CVE-2026-88812
-
report
https://access.redhat.com/security/cve/CVE-2026-93521
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report
https://access.redhat.com/security/cve/CVE-2026-93523
-
report
https://bugzilla.redhat.com/2545164
-
report
https://bugzilla.redhat.com/2545174
-
report
https://bugzilla.redhat.com/2545177
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advisory
https://errata.almalinux.org/9/ALSA-2026-82015.html