Vulnerability · Published Oct 28, 2026 · Assigned by suse
CVE-2026-93521X.Org Server RandR ChangeProviderProperty Heap Buffer Overflow
High 7.8
In plain English
A high-severity heap buffer overflow in xorg-x11-server 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 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 89.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A buffer overflow in RandR ChangeProviderProperty requests in X.Org X Server before 2.1.25 and XWayland before 24.4.14 could be used by authenticated X clients to crash or execute code within the 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_8.4 | ALSA-2026:82015 |
| 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_8.4 | ALSA-2026:82015 |
| 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_8.4 | ALSA-2026:82015 |
| 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_8.4 | ALSA-2026:82015 |
| 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_8.4 | ALSA-2026:82015 |
| 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_8.4 | ALSA-2026:82015 |
| 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_8.4 | ALSA-2026:82015 |
| 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_8.4 | ALSA-2026:82015 |
| Alpine:v3.24 | xorg-server | 21.1.25-r0 | ALPINE-CVE-2026-93521 |
| Alpine:v3.24 | xwayland | 24.1.14-r0 | ALPINE-CVE-2026-93521 |
| Debian:12 | xorg-server | no fix listed | DEBIAN-CVE-2026-93521 |
| Debian:13 | xorg-server | no fix listed | DEBIAN-CVE-2026-93521 |
| Debian:14 | xorg-server | 2:21.1.25-1 | DEBIAN-CVE-2026-93521 |
| Debian:12 | xwayland | no fix listed | DEBIAN-CVE-2026-93521 |
| Debian:13 | xwayland | no fix listed | DEBIAN-CVE-2026-93521 |
| Debian:14 | xwayland | 2:24.1.14-1 | DEBIAN-CVE-2026-93521 |
| 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_8.4 | RLSA-2026:82015 |
| 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-2026-93521 |
| Ubuntu:24.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93521 |
| Ubuntu:26.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93521 |
| Ubuntu:26.10 | xorg-server | no fix listed | UBUNTU-CVE-2026-93521 |
| Ubuntu:22.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93521 |
| Ubuntu:24.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93521 |
| Ubuntu:26.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93521 |
| Ubuntu:26.10 | xwayland | no fix listed | UBUNTU-CVE-2026-93521 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| x.org | xorg-x11-server | 0 – before 21.1.25 |
| x.org | xwayland | 0 – before 24.1.14 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H