CVE-2026-109093
Published:November 10, 2026
Updated:November 11, 2026
X.Org X server and Xwayland: ProcXTestFakeInput copies DeviceValuator fields into a fixed stack array (MAX_VALUATORS) before checking that the valuator range fits, so enough DeviceValuator events write past the array (stack out-of-bounds write). Fixed in xorg-server 21.1.26 and xwayland 24.1.15 (X.Org Security Advisory, 2026-11-10).
Affected Packages
https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) >=xorg-server-1.5.99.1 <xorg-server-21.1.26 || >=xorg-server-21.0.99.1 <xorg-server-21.1.26Fix Suggestion:
Update to version xorg-server-21.1.26https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) >=xwayland-21.0.99.901 <xwayland-24.1.15 || >=xwayland-22.0.99.901 <xwayland-24.1.15 || >=xwayland-23.0.99.901 <xwayland-24.1.15 || >=xwayland-24.0.99.901 <xwayland-24.1.15Fix Suggestion:
Update to version xwayland-24.1.15Related Resources (1)
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Contact UsCVSS v4
Base Score:
8.5
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH