CVE-2026-93523

X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write

Published Oct 28, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A flaw was found in xorg-x11-server. A local authenticated client can exploit this flaw by sending a crafted input device ungrab request with an unvalidated modifier value. This lack of validation causes the server to perform an out-of-bounds write on the heap, resulting in memory corruption that can lead to a denial of service (DoS) or potential arbitrary code execution. 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.
Title xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write
First Time appeared X.org xorg-x11-server
X.org xwayland
Weaknesses CWE-122
CPEs cpe:2.3:a:x.org:xorg-x11-server:*:*:*:*:*:*:*:*
cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*
Vendors & Products X.org xorg-x11-server
X.org xwayland
References
Type Values Removed Values Added
First Time appeared X.org
X.org x Server
Vendors & Products X.org
X.org x Server
Type Values Removed Values Added
Description A flaw was found in xorg-x11-server. A local authenticated client can exploit this flaw by sending a crafted input device ungrab request with an unvalidated modifier value. This lack of validation causes the server to perform an out-of-bounds write on the heap, resulting in memory corruption that can lead to a denial of service (DoS) or potential arbitrary code execution.
Title xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice
Weaknesses CWE-787
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Weaknesses

Sources

Status
PUBLISHED
Assigner
suse
Published
Updated
Nov 7, 2026, 4:55 AM
Reserved
Sep 18, 2026, 8:46 AM
Status
Awaiting Analysis
Published
Oct 28, 2026, 5:18 PM
Modified
Nov 7, 2026, 5:19 AM
Severity
Important
Public date
Oct 7, 2026, 12:00 PM