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Fencer Vulns
high 7.8

CVE-2026-93522 json

X.Org Server Glamor CopyArea Heap Buffer Overflow

published 2026-10-28 11 d ago modified 2026-11-05 3 d ago also EUVD-2026-112254

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 mismatched size usage in CopyArea CPU-to-FBO path 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 the 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

debian advisories DEBIAN-CVE-2026-93522

  • 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

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

  • xwayland SLE Workstation Extension 15 SP7 24.1.5-150700.3.25.1
  • xwayland SLES for SAP applications 16.0, SLES 16.0 24.1.6-160000.7.1

suse advisories SUSE-SU-2026:4835-1SUSE-SU-2026:24230-1

  • xwayland openSUSE Leap 16.0 24.1.6-160000.7.1
  • xwayland openSUSE Tumbleweed 24.1.13-2.1

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

  • xorg-x11-server-Xwayland AlmaLinux 10 24.1.9-4.el10_2.4
  • xorg-x11-server-Xwayland AlmaLinux 9 24.1.9-4.el9_8.4

almalinux advisories ALSA-2026:85191ALSA-2026:85193

  • 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

rocky linux advisories RLSA-2026:85191RLSA-2026:85193

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

alpine advisories ALPINE-CVE-2026-93522

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-112297

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-2026-93522 updated cvss 7.8

xorg-x11-server: glamor: size tmp_bits buffer for source coordinate range in upload_boxes

  • Red Hat Enterprise Linux 6 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +2 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +3 more Red Hat Enterprise Linux 9 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +2 more
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-Xwayland 24.1.9-4.el9_8.4
    fixed: vendor fix RHSA-2026:85193
  • 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-Xwayland 24.1.9-4.el9_8.4
    fixed: vendor fix RHSA-2026:85193
  • 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 7 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +3 more Red Hat Enterprise Linux 8 xorg-x11-server-Xwayland
    not affected: vulnerable code not present

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.