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Fencer Vulns
medium 6.9

CVE-2026-93524 json

X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read

published 2026-10-28 12 d ago modified 2026-11-06 2 d ago also EUVD-2026-112228

cvss
6.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

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.

Patch / fix

  • x.org xorg-x11-server 21.1.25
  • x.org xwayland 24.1.14
  • xwayland Debian 14 2:24.1.14-1
  • xorg-server Debian 14 2:21.1.25-1

debian advisories DEBIAN-CVE-2026-93524

  • xwayland SLE Workstation Extension 15 SP7 24.1.5-150700.3.25.1
  • xorg-x11-server SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.20.3-150400.38.77.1
  • xorg-x11-server SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 21.1.15-150700.5.25.1
  • xorg-x11-server SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 21.1.4-150500.7.55.1
  • xwayland SLES for SAP applications 16.0, SLES 16.0 24.1.6-160000.7.1
  • xorg-x11-server SLES for SAP 15 SP6, SLES 15 SP6-LTSS 21.1.11-150600.5.34.1
  • xorg-x11-server SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.19.6-10.108.1

suse advisories SUSE-SU-2026:4835-1SUSE-SU-2026:4663-1SUSE-SU-2026:4647-1SUSE-SU-2026:4646-1SUSE-SU-2026:4645-1SUSE-SU-2026:4636-1

  • xwayland openSUSE Leap 16.0 24.1.6-160000.7.1
  • xorg-x11-server openSUSE Tumbleweed 21.1.24-2.1
  • xwayland openSUSE Tumbleweed 24.1.13-2.1

opensuse advisories openSUSE-SU-2026:22085-1openSUSE-SU-2026:12104-1openSUSE-SU-2026:12105-1

  • xwayland Alpine 3.24 24.1.14-r0
  • xorg-server Alpine 3.24 21.1.25-r0

alpine advisories ALPINE-CVE-2026-93524

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • xorg-x11-server-Xwayland Azure Linux 3.0 24.1.14-1

azure linux advisories AZL-112309

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-93524 updated cvss 3.3

xorg-x11-server: xorg-x11-server: information disclosure via crafted keyboard mapping requests

  • Red Hat Enterprise Linux 6 tigervnc, tigervnc-server, xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, +6 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 tigervnc, tigervnc-icons, tigervnc-server, xorg-x11-server, tigervnc-license, xorg-x11-server-Xdmx, +10 more Red Hat Enterprise Linux 8 tigervnc, tigervnc-icons, tigervnc-server, xorg-x11-server, tigervnc-license, tigervnc-selinux, +11 more Red Hat Enterprise Linux 9 tigervnc, tigervnc-icons, tigervnc-server, xorg-x11-server, tigervnc-license, tigervnc-selinux, +10 more Red Hat Enterprise Linux 10 xorg-x11-server-Xwayland
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 d ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 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
CNA 4.0 6.9 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • x.org xorg-x11-server
  • x.org xwayland

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.