A stack buffer overflow in  ProcXTestFakeInput DeviceValuator handling in X.Org xwayland before 24.1.15 and X server before 21.1.26 could be used by authenticated clients to crash or execute code in the X server.

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
X.Org xwayland unaffected
Version Status Constraints
0 affected < 24.1.15
X.Org xorg-x11-server unaffected
Version Status Constraints
0 affected < 21.1.26

No data.

No data.

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Project Subscriptions

Vendors Products
X.org Subscribe
Xorg-x11-server Subscribe
Xwayland Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://gitlab.freedesktop.org/xorg/xserver/-/commit/99ce069ae814b39048543062e073320f14723ee0 cve-icon cve-icon
History

Fri, 13 Nov 2026 14:30:00 +0000

Type Values Removed Values Added
Description A stack buffer overflow in  ProcXTestFakeInput DeviceValuator handling in X.Org xwayland before 24.1.15 and X server before 21.1.26 could be used by authenticated clients to crash or execute code in the X server.
Title X.Org Server XTestFakeInput Valuator Stack Out-Of-Bounds Write
First Time appeared X.org
X.org xorg-x11-server
X.org xwayland
Weaknesses CWE-121
CPEs cpe:2.3:a:x.org:xorg-x11-server:*:*:*:*:*:*:*:*
cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*
Vendors & Products X.org
X.org xorg-x11-server
X.org xwayland
References
Metrics cvssV4_0

{'score': 8.5, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: suse

Published:

Updated: 2026-11-13T14:23:59.219Z

Reserved: 2026-10-12T06:41:23.778Z

Link: CVE-2026-109093

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-13T15:17:29.873

Modified: 2026-11-13T15:17:29.977

Link: CVE-2026-109093

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses