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Vulnerability · Published Oct 28, 2026 · Assigned by suse

CVE-2026-93517X.Org Server GLX RenderLarge Heap Buffer Overflow

High 8.5

In plain English

A high-severity heap buffer overflow in xwayland from x.org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.5High
Exploit odds (30 days)0.2%top 91.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8xorg-x11-server-Xdmx1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-Xdmx1.20.11-34.el9_8.5ALSA-2026:84574
AlmaLinux:8xorg-x11-server-Xephyr1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-Xephyr1.20.11-34.el9_8.5ALSA-2026:84574
AlmaLinux:8xorg-x11-server-Xnest1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-Xnest1.20.11-34.el9_8.5ALSA-2026:84574
AlmaLinux:8xorg-x11-server-Xorg1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-Xorg1.20.11-34.el9_8.5ALSA-2026:84574
AlmaLinux:8xorg-x11-server-Xvfb1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-Xvfb1.20.11-34.el9_8.5ALSA-2026:84574
AlmaLinux:10xorg-x11-server-Xwayland24.1.9-4.el10_2.4ALSA-2026:85191
AlmaLinux:8xorg-x11-server-Xwayland21.1.3-20.el8_10.4ALSA-2026:86907
AlmaLinux:9xorg-x11-server-Xwayland24.1.9-4.el9_8.4ALSA-2026:85193
AlmaLinux:10xorg-x11-server-Xwayland-devel24.1.9-4.el10_2.4ALSA-2026:85191
AlmaLinux:9xorg-x11-server-Xwayland-devel24.1.9-4.el9_8.4ALSA-2026:85193
AlmaLinux:8xorg-x11-server-common1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-common1.20.11-34.el9_8.5ALSA-2026:84574
AlmaLinux:8xorg-x11-server-devel1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-devel1.20.11-34.el9_8.5ALSA-2026:84574
AlmaLinux:8xorg-x11-server-source1.20.11-28.el8_10.5ALSA-2026:89747
AlmaLinux:9xorg-x11-server-source1.20.11-34.el9_8.5ALSA-2026:84574
Alpine:v3.24xorg-server21.1.25-r0ALPINE-CVE-2026-93517
Alpine:v3.24xwayland24.1.14-r0ALPINE-CVE-2026-93517
Debian:12xorg-serverno fix listedDEBIAN-CVE-2026-93517
Debian:13xorg-serverno fix listedDEBIAN-CVE-2026-93517
Debian:14xorg-server2:21.1.25-1DEBIAN-CVE-2026-93517
Debian:12xwaylandno fix listedDEBIAN-CVE-2026-93517
Debian:13xwaylandno fix listedDEBIAN-CVE-2026-93517
Debian:14xwayland2:24.1.14-1DEBIAN-CVE-2026-93517
Rocky Linux:8xorg-x11-server0:1.20.11-28.el8_10.5RLSA-2026:89747
Rocky Linux:9xorg-x11-server0:1.20.11-34.el9_8.5RLSA-2026:84574
Rocky Linux:10xorg-x11-server-Xwayland0:24.1.9-4.el10_2.4RLSA-2026:85191
Rocky Linux:8xorg-x11-server-Xwayland0:21.1.3-20.el8_10.4RLSA-2026:86907
Rocky Linux:9xorg-x11-server-Xwayland0:24.1.9-4.el9_8.4RLSA-2026:85193
Ubuntu:22.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-93517
Ubuntu:24.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-93517
Ubuntu:26.04:LTSxorg-serverno fix listedUBUNTU-CVE-2026-93517
Ubuntu:26.10xorg-serverno fix listedUBUNTU-CVE-2026-93517
Ubuntu:22.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-93517
Ubuntu:24.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-93517
Ubuntu:26.04:LTSxwaylandno fix listedUBUNTU-CVE-2026-93517
Ubuntu:26.10xwaylandno fix listedUBUNTU-CVE-2026-93517

Affected products (as reported)

VendorProductVersions
x.orgg xorg-x11-server 0 – before 21.1.25
x.org xwayland 0 – before 24.1.14

Weakness: CWE-122 · 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

References