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Medium6.1Red Hat Linux

Medium [CVE-2026-34002] X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling

This medium-severity Red Hat Linux advisory covers CVE-2026-34002 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6.

CVE-2026-34002 Published May 5, 2026
CVE-2026-34002
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling. Red Hat rates this moderate (CVSS 6.1).

Weakness: CWE-805. 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 6; Red Hat Enterprise Linux 1; 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-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
  • tigervnc-0:1.1.0-25.el6_10.16
  • xorg-x11-server-Xwayland-0:23.2.7-6.el9_6
  • xorg-x11-server-0:1.20.10-4.el8_4
  • xorg-x11-server-Xwayland-0:21.1.3-2.el8_6.6
  • xorg-x11-server-0:1.20.11-7.el8_6
  • xorg-x11-server-0:1.20.11-18.el8_8

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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