Description
A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.
Published: 2026-10-28
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 28 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in xorg-x11-server. An authenticated local user can trigger an out-of-bounds heap memory read by sending specially crafted X Keyboard Extension (XKB) requests with inconsistent key range parameters. This flaw leads to information disclosure, allowing the user to read sensitive data from the server's heap memory. A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.
Title xorg-x11-server: XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read
First Time appeared X.org xorg-x11-server
X.org xwayland
Weaknesses CWE-126
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
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}


Sun, 18 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared X.org
X.org x Server
Vendors & Products X.org
X.org x Server

Thu, 08 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
Description A flaw was found in xorg-x11-server. An authenticated local user can trigger an out-of-bounds heap memory read by sending specially crafted X Keyboard Extension (XKB) requests with inconsistent key range parameters. This flaw leads to information disclosure, allowing the user to read sensitive data from the server's heap memory.
Title xorg-x11-server: XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read
Weaknesses CWE-125
References
Metrics threat_severity

None

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

threat_severity

Low


Subscriptions

X.org X Server Xorg-x11-server Xwayland
cve-icon MITRE

Status: PUBLISHED

Assigner: suse

Published:

Updated: 2026-10-28T16:24:52.508Z

Reserved: 2026-09-18T08:46:56.692Z

Link: CVE-2026-93524

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-28T17:18:53.340

Modified: 2026-10-29T15:04:37.187

Link: CVE-2026-93524

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-07T12:00:00Z

Links: CVE-2026-93524 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T17:45:02Z

Weaknesses