Paper/Archive/CVE-2026-34000

CVE-2026-34000

Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support — Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

EPSS 0.5%CVSS 9.1

critical.is priorityof 100

CVSS 9.1 (NVD)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 42.0.420 × 208.4 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

Affected

ProductAffectedFixed inSource

Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:24.1.5-6.el10_0CNA

Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONsee advisory0:1.1.0-25.el6_10.16CNA

Red Hat Enterprise Linux 7 Extended Lifecycle Supportsee advisory0:1.20.4-34.el7_9CNA

Red Hat Enterprise Linux 7 Extended Lifecycle Supportsee advisory0:1.8.0-36.el7_9.4CNA

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:1.20.10-4.el8_4CNA

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:1.11.0-8.el8_4.15CNA

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onsee advisory0:1.20.10-4.el8_4CNA

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onsee advisory0:1.11.0-8.el8_4.15CNA

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory0:21.1.3-2.el8_6.6CNA

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory0:1.20.11-7.el8_6CNA

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory0:1.12.0-6.el8_6.17CNA

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onsee advisory0:1.12.0-6.el8_6.17CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

redhat (CNA)6.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References