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Fencer Vulns
high 7.8

CVE-2026-93523 json

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

published 2026-10-28 11 d ago modified 2026-11-07 2 d ago also EUVD-2026-112256

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

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.

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-2026-93523

  • xorg-x11-server-Xwayland RHEL 10.2 24.1.9-4.el10_2.4
  • xorg-x11-server-Xwayland RHEL 9 24.1.9-4.el9_8.4
  • xorg-x11-server RHEL 9 1.20.11-34.el9_8.4
  • xorg-x11-server-Xdmx RHEL 9 1.20.11-34.el9_8.4
  • xorg-x11-server-Xorg RHEL 9 1.20.11-34.el9_8.4
  • xorg-x11-server-Xvfb RHEL 9 1.20.11-34.el9_8.4
  • xorg-x11-server-Xnest RHEL 9 1.20.11-34.el9_8.4
  • xorg-x11-server-common RHEL 9 1.20.11-34.el9_8.4

red hat advisories RHSA-2026:85191RHSA-2026:85193RHSA-2026:82015

  • 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

  • xorg-x11-server-Xdmx AlmaLinux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-Xorg AlmaLinux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-Xvfb AlmaLinux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-Xnest AlmaLinux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-common AlmaLinux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-source AlmaLinux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-Xephyr AlmaLinux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-Xwayland AlmaLinux 8 21.1.3-20.el8_10.4

almalinux advisories ALSA-2026:89747ALSA-2026:86907ALSA-2026:85191ALSA-2026:85193ALSA-2026:82015

  • xorg-x11-server Rocky Linux 8 1.20.11-28.el8_10.5
  • xorg-x11-server-Xwayland Rocky Linux 8 21.1.3-20.el8_10.4
  • xorg-x11-server-Xwayland Rocky Linux 10 24.1.9-4.el10_2.4
  • xorg-x11-server-Xwayland Rocky Linux 9 24.1.9-4.el9_8.4
  • xorg-x11-server Rocky Linux 9 1.20.11-34.el9_8.4

rocky linux advisories RLSA-2026:89747RLSA-2026:86907RLSA-2026:85191RLSA-2026:85193RLSA-2026:82015

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

alpine advisories ALPINE-CVE-2026-93523

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-112279

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-2026-93523 updated cvss 7.8

xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice

  • 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, tigervnc-license, tigervnc-selinux, tigervnc-server-applet, +2 more Red Hat Enterprise Linux 9 tigervnc, tigervnc-icons, tigervnc-server, tigervnc-license, tigervnc-selinux, tigervnc-server-module, +1 more
    affected: workaround, no fix available
  • 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
    under investigation
  • Red Hat Enterprise Linux AppStream (v. 8) xorg-x11-server 1.20.11-28.el8_10.5, xorg-x11-server-Xdmx 1.20.11-28.el8_10.5, xorg-x11-server-Xorg 1.20.11-28.el8_10.5, xorg-x11-server-Xvfb 1.20.11-28.el8_10.5, xorg-x11-server-Xnest 1.20.11-28.el8_10.5, xorg-x11-server-common 1.20.11-28.el8_10.5, +2 more
    fixed: vendor fix RHSA-2026:89747
  • Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server 1.20.11-34.el9_8.4, xorg-x11-server-Xdmx 1.20.11-34.el9_8.4, xorg-x11-server-Xorg 1.20.11-34.el9_8.4, xorg-x11-server-Xvfb 1.20.11-34.el9_8.4, xorg-x11-server-Xnest 1.20.11-34.el9_8.4, xorg-x11-server-common 1.20.11-34.el9_8.4, +2 more
    fixed: vendor fix RHSA-2026:82015
  • Red Hat Enterprise Linux AppStream (v. 10) xorg-x11-server-Xwayland 24.1.9-4.el10_2.4
    fixed: vendor fix RHSA-2026:85191
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) xorg-x11-server-source 1.20.11-34.el9_8.4, xorg-x11-server-Xwayland 24.1.9-4.el9_8.4
    fixed: vendor fix RHSA-2026:82015
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) xorg-x11-server-Xwayland-devel 24.1.9-4.el10_2.4, xorg-x11-server-Xwayland-debuginfo 24.1.9-4.el10_2.4, xorg-x11-server-Xwayland-debugsource 24.1.9-4.el10_2.4
    fixed: vendor fix RHSA-2026:85191
  • Red Hat Enterprise Linux CRB (v. 8) xorg-x11-server-source 1.20.11-28.el8_10.5
    fixed: vendor fix RHSA-2026:89747

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
total
Assessed
3 d ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

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

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

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.