All vulnerabilities
CVE-2026-93524

xorg-x11-server: X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read

x.org xorg-x11-server
Open in ThreatlineRecord JSON
CVSS
6.9Medium
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 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.

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