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
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | xorg-x11-server-Xdmx | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-Xdmx | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| AlmaLinux:8 | xorg-x11-server-Xephyr | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-Xephyr | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| AlmaLinux:8 | xorg-x11-server-Xnest | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-Xnest | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| AlmaLinux:8 | xorg-x11-server-Xorg | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-Xorg | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| AlmaLinux:8 | xorg-x11-server-Xvfb | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-Xvfb | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| AlmaLinux:10 | xorg-x11-server-Xwayland | 24.1.9-4.el10_2.4 | ALSA-2026:85191 |
| AlmaLinux:8 | xorg-x11-server-Xwayland | 21.1.3-20.el8_10.4 | ALSA-2026:86907 |
| AlmaLinux:9 | xorg-x11-server-Xwayland | 24.1.9-4.el9_8.4 | ALSA-2026:85193 |
| AlmaLinux:10 | xorg-x11-server-Xwayland-devel | 24.1.9-4.el10_2.4 | ALSA-2026:85191 |
| AlmaLinux:9 | xorg-x11-server-Xwayland-devel | 24.1.9-4.el9_8.4 | ALSA-2026:85193 |
| AlmaLinux:8 | xorg-x11-server-common | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-common | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| AlmaLinux:8 | xorg-x11-server-devel | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-devel | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| AlmaLinux:8 | xorg-x11-server-source | 1.20.11-28.el8_10.5 | ALSA-2026:89747 |
| AlmaLinux:9 | xorg-x11-server-source | 1.20.11-34.el9_8.5 | ALSA-2026:84574 |
| Alpine:v3.24 | xorg-server | 21.1.25-r0 | ALPINE-CVE-2026-93517 |
| Alpine:v3.24 | xwayland | 24.1.14-r0 | ALPINE-CVE-2026-93517 |
| Debian:12 | xorg-server | no fix listed | DEBIAN-CVE-2026-93517 |
| Debian:13 | xorg-server | no fix listed | DEBIAN-CVE-2026-93517 |
| Debian:14 | xorg-server | 2:21.1.25-1 | DEBIAN-CVE-2026-93517 |
| Debian:12 | xwayland | no fix listed | DEBIAN-CVE-2026-93517 |
| Debian:13 | xwayland | no fix listed | DEBIAN-CVE-2026-93517 |
| Debian:14 | xwayland | 2:24.1.14-1 | DEBIAN-CVE-2026-93517 |
| Rocky Linux:8 | xorg-x11-server | 0:1.20.11-28.el8_10.5 | RLSA-2026:89747 |
| Rocky Linux:9 | xorg-x11-server | 0:1.20.11-34.el9_8.5 | RLSA-2026:84574 |
| Rocky Linux:10 | xorg-x11-server-Xwayland | 0:24.1.9-4.el10_2.4 | RLSA-2026:85191 |
| Rocky Linux:8 | xorg-x11-server-Xwayland | 0:21.1.3-20.el8_10.4 | RLSA-2026:86907 |
| Rocky Linux:9 | xorg-x11-server-Xwayland | 0:24.1.9-4.el9_8.4 | RLSA-2026:85193 |
| Ubuntu:22.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93517 |
| Ubuntu:24.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93517 |
| Ubuntu:26.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93517 |
| Ubuntu:26.10 | xorg-server | no fix listed | UBUNTU-CVE-2026-93517 |
| Ubuntu:22.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93517 |
| Ubuntu:24.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93517 |
| Ubuntu:26.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93517 |
| Ubuntu:26.10 | xwayland | no fix listed | UBUNTU-CVE-2026-93517 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| 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