CVE-2026-93518

CVE Details

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

Description

A flaw was found in xorg-x11-server. Due to an integer truncation issue during memory allocation calculations within the X Keyboard Extension (XKB), the server allocates an undersized buffer when resizing key types. An authenticated local client can exploit this vulnerability by sending specially crafted XKB requests, causing a heap-based buffer overflow. This can result in arbitrary code execution or a denial of service (DoS). (From Red Hat.)

See more information about CVE-2026-93518 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