CVE-2026-93517

X.Org Server GLX RenderLarge Heap Buffer Overflow

Published Oct 28, 2026 CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
Description
A heap buffer overflow in handling GLX
RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution 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. The GLX (OpenGL Extension to the X Window System) interface fails to verify that incoming data sizes do not exceed allocated buffer limits when handling large rendering requests. An authenticated local client can exploit this vulnerability by sending a specially crafted request, triggering a heap-based buffer overflow. Successful exploitation can result in arbitrary code execution with the privileges of the X server or cause a Denial of Service (DoS) by crashing the application. A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server context.
Title xorg-x11-server: GLX sanitization flaw X.Org Server GLX RenderLarge Heap Buffer Overflow
First Time appeared X.org xwayland
X.orgg
X.orgg xorg-x11-server
Weaknesses CWE-122
CPEs cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*
cpe:2.3:a:x.orgg:xorg-x11-server:*:*:*:*:*:*:*:*
Vendors & Products X.org xwayland
X.orgg
X.orgg xorg-x11-server
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'}

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. The GLX (OpenGL Extension to the X Window System) interface fails to verify that incoming data sizes do not exceed allocated buffer limits when handling large rendering requests. An authenticated local client can exploit this vulnerability by sending a specially crafted request, triggering a heap-based buffer overflow. Successful exploitation can result in arbitrary code execution with the privileges of the X server or cause a Denial of Service (DoS) by crashing the application.
Title xorg-x11-server: GLX sanitization flaw
Weaknesses CWE-120
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

Moderate

Weaknesses

Sources

Status
PUBLISHED
Assigner
suse
Published
Updated
Nov 5, 2026, 6:30 PM
Reserved
Sep 18, 2026, 8:46 AM
Status
Awaiting Analysis
Published
Oct 28, 2026, 2:17 PM
Modified
Nov 5, 2026, 7:17 PM
Severity
Moderate
Public date
Oct 7, 2026, 12:00 PM