CVE-2026-93520

CVE Details

Release Date:	2026-10-07
Impact:	Moderate	What is this?

Description

A flaw was found in xorg-x11-server. In the X Keyboard Extension (XKB), key name memory is allocated with an insufficient buffer size compared to the maximum supported range. An authenticated local client can exploit this flaw by sending requests that modify the keycode range, triggering a heap-based buffer overflow. This vulnerability can lead to arbitrary code execution or cause a Denial of Service (DoS) by crashing the X server. (From Red Hat.)

See more information about CVE-2026-93520 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (xorg-x11-server-Xwayland)	ELSA-2026-85191	2026-10-19
Oracle Linux version 9 (xorg-x11-server)	ELSA-2026-84574	2026-10-19
Oracle Linux version 9 (xorg-x11-server-Xwayland)	ELSA-2026-85193	2026-10-19