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Medium6.1Red Hat Linux

Medium [CVE-2026-34000] X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing.

This medium-severity Red Hat Linux advisory covers CVE-2026-34000 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 1.

CVE-2026-34000 Published May 5, 2026
CVE-2026-34000
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing.. Red Hat rates this moderate (CVSS 6.1).

Weakness: CWE-125. Affected package(s): tigervnc, xorg-x11-server-Xwayland, xorg-x11-server.

Resolved in Red Hat advisory RHSA-2026:24341 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 6; and 1 more.

Affected versions
  • tigervnc-0:1.11.0-8.el8_4.15
  • xorg-x11-server-Xwayland-0:21.1.3-10.el9_2
  • tigervnc-0:1.14.1-10.el9_6
  • xorg-x11-server-Xwayland-0:21.1.3-2.el8_6.6
  • tigervnc-0:1.15.0-7.el9_8.1
  • xorg-x11-server-0:1.20.11-20.el9_2
  • xorg-x11-server-Xwayland-0:24.1.5-6.el10_0
  • tigervnc-0:1.12.0-15.el8_8.17
  • xorg-x11-server-Xwayland-0:21.1.3-5.el9_0
  • xorg-x11-server-0:1.20.11-28.el9_4
  • xorg-x11-server-0:1.20.11-33.el9_6
  • tigervnc-0:1.13.1-8.el9_4.9

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • RHSA-2026:24341

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:24341 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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