Vulnerability · Published Oct 28, 2026 · Assigned by suse
CVE-2026-93524X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read
Medium 6.9
In plain English
A medium-severity security flaw 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 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.2%top 92.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | xorg-server | 21.1.25-r0 | ALPINE-CVE-2026-93524 |
| Alpine:v3.24 | xwayland | 24.1.14-r0 | ALPINE-CVE-2026-93524 |
| Debian:12 | xorg-server | no fix listed | DEBIAN-CVE-2026-93524 |
| Debian:13 | xorg-server | no fix listed | DEBIAN-CVE-2026-93524 |
| Debian:14 | xorg-server | 2:21.1.25-1 | DEBIAN-CVE-2026-93524 |
| Debian:12 | xwayland | no fix listed | DEBIAN-CVE-2026-93524 |
| Debian:13 | xwayland | no fix listed | DEBIAN-CVE-2026-93524 |
| Debian:14 | xwayland | 2:24.1.14-1 | DEBIAN-CVE-2026-93524 |
| Ubuntu:22.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93524 |
| Ubuntu:24.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93524 |
| Ubuntu:26.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-93524 |
| Ubuntu:26.10 | xorg-server | no fix listed | UBUNTU-CVE-2026-93524 |
| Ubuntu:22.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93524 |
| Ubuntu:24.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93524 |
| Ubuntu:26.04:LTS | xwayland | no fix listed | UBUNTU-CVE-2026-93524 |
| Ubuntu:26.10 | xwayland | no fix listed | UBUNTU-CVE-2026-93524 |
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-126 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N