CVE-2026-34001 HIGH

CVE-2026-34001: Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-825
Published April 23, 2026
Last update June 30, 2026

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.

Key dates

02Disclosure timeline

April 23, 2026 CVE published
June 30, 2026 Record updated