CVE-2026-93520 — HIGH (7.8)

Vulnerability 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.

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-122

References

https://gitlab.freedesktop.org/xorg/xserver/-/commit/b941a473e06f26a407a9adb1575

FAQ

What is CVE-2026-93520?

CVE-2026-93520 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...

How severe is CVE-2026-93520?

CVE-2026-93520 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-93520?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.