High7.8Red Hat & Ubuntu Linux
stack buffer overflow in XKB key types due to unchecked shift levels
CVE-2026-50258 Published Jun 2, 2026
CVE-2026-50258
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
stack buffer overflow in XKB key types due to unchecked shift levels. Red Hat rates this important (CVSS 7.8). Weakness: CWE-121. Affected package(s): xorg-x11-server, xorg-x11-server-Xwayland, tigervnc. Resolved in Red Hat advisory RHSA-2026:26562 — update the affected packages (`sudo dnf update`).
Affected versions
- xorg-x11-server-0:1.20.11-34.el9_8.2
- xorg-x11-server-Xwayland-0:21.1.3-20.el8_10.2
- tigervnc-0:1.15.0-7.el9_8.2
- xorg-x11-server-Xwayland-0:24.1.9-4.el9_8.2
- xorg-x11-server-0:1.20.11-28.el8_10.2
- tigervnc-0:1.15.0-10.el8_10
- xorg-x11-server-Xwayland-0:24.1.9-4.el10_2.2
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
Fixed versions
- RHSA-2026:26562
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:26562 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
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