All vulnerabilities
CVE-2026-93520

xorg-x11-server: X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write

x.org xorg-x11-server
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in21.1.25Also 24.1.14CVE List
Published28 Oct 2026Updated 28 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

Text from CVE List

Affected versions 2

  • xorg-x11-serveraffected: all versions before 21.1.25CVE List
  • xwaylandaffected: all versions before 24.1.14CVE List

References 1