Double free in X.org Server - CVE-2026-88812

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Main Vulnerability Database Vulnerabilities #VU157680

Double free in X.org Server - CVE-2026-88812

Published: October 26, 2026


Vulnerability identifier: #VU157680
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-88812
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the target system.

The vulnerability exists due to a boundary error within the handling of SetGeometry requests. A local user can pass specially crafted data to the application, trigger double free error and gain elevated privileges on the system.


Affected software

X.org Server
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
openEuler
Anolis OS
Fedora
tigervnc-selinux
tigervnc-license
tigervnc-icons
tigervnc-doc
tigervnc-server-module
tigervnc-server-minimal
tigervnc-server
tigervnc
xorg-x11-server-common
xorg-x11-server
xorg-x11-server-Xdmx
xorg-x11-server-Xephyr
xorg-x11-server-Xnest
xorg-x11-server-Xvfb
xorg-x11-server-debuginfo
xorg-x11-server-debugsource
xorg-x11-server-devel
xorg-x11-server-help
xorg-x11-server-source
xorg-x11-server-Xorg
xorg-x11-server-Xwayland (Red Hat package)
xorg-x11-server-Xwayland-doc
xorg-x11-server-Xwayland-devel
xorg-x11-server-Xwayland

How to mitigate CVE-2026-88812

Install updates from vendor's website.

tigervnc-selinux - update to 1.13.1-12
tigervnc-license - update to 1.13.1-12
tigervnc-icons - update to 1.13.1-12
tigervnc-doc - update to 1.13.1-12
tigervnc-server-module - update to 1.13.1-12
tigervnc-server-minimal - update to 1.13.1-12
tigervnc-server - update to 1.13.1-12
tigervnc - update to 1.13.1-12
xorg-x11-server-common - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-Xdmx - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-Xephyr - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-Xnest - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-Xvfb - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-debuginfo - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-debugsource - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-devel - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-help - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-source - addressed in versions 1.20.11-48, 1.20.11-49
xorg-x11-server-common - update to 1.20.14-30
xorg-x11-server-source - update to 1.20.14-30
xorg-x11-server-devel - update to 1.20.14-30
xorg-x11-server-Xorg - update to 1.20.14-30
xorg-x11-server-Xnest - update to 1.20.14-30
xorg-x11-server-Xephyr - update to 1.20.14-30
xorg-x11-server-Xdmx - update to 1.20.14-30
xorg-x11-server-Xvfb - update to 1.20.14-30
xorg-x11-server-Xwayland (Red Hat package) - addressed in versions 21.1.3-20.el8_10.4, 24.1.9-4.el10_2.4
xorg-x11-server - addressed in versions 21.1.25-1.fc44, 21.1.25-1.fc45, 21.1.25-2.fc44, 21.1.25-2.fc45
xorg-x11-server-Xwayland-doc - update to 23.2.5-13
xorg-x11-server-Xwayland-devel - update to 23.2.5-13
xorg-x11-server-Xwayland - update to 23.2.5-13
xorg-x11-server-Xwayland - addressed in versions 24.1.14-1.fc43, 24.1.14-1.fc44, 24.1.14-1.fc45

External References

Related Security Bulletins