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Linux Distros Unpatched Vulnerability : CVE-2026-50263

medium Nessus Plugin ID 318747

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure. (CVE-2026-50263)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-50263

https://security-tracker.debian.org/tracker/CVE-2026-50263

https://ubuntu.com/security/CVE-2026-50263

Plugin Details

Severity: Medium

ID: 318747

File Name: unpatched_CVE_2026_50263.nasl

Version: 1.11

Type: Local

Agent: unix

Family: Misc.

Published: 6/5/2026

Updated: 6/25/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5.1

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:12.0, cpe:/o:redhat:enterprise_linux:7, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:9, cpe:/o:redhat:enterprise_linux:6, cpe:/o:debian:debian_linux:13.0, cpe:/o:debian:debian_linux:11.0, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:centos:centos:tigervnc, p-cpe:/a:redhat:enterprise_linux:tigervnc, p-cpe:/a:redhat:enterprise_linux:tigervnc-icons, p-cpe:/a:centos:centos:tigervnc-icons, p-cpe:/a:redhat:enterprise_linux:tigervnc-license, p-cpe:/a:centos:centos:tigervnc-license, p-cpe:/a:redhat:enterprise_linux:tigervnc-server, p-cpe:/a:centos:centos:tigervnc-server, p-cpe:/a:centos:centos:tigervnc-server-minimal, p-cpe:/a:redhat:enterprise_linux:tigervnc-server-minimal, p-cpe:/a:centos:centos:xorg-x11-server-xephyr, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xephyr, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xorg, p-cpe:/a:centos:centos:xorg-x11-server-xorg, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xvfb, p-cpe:/a:centos:centos:xorg-x11-server-xvfb, p-cpe:/a:centos:centos:xorg-x11-server-common, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-common, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xwayland, p-cpe:/a:centos:centos:xorg-x11-server-xwayland, p-cpe:/a:debian:debian_linux:xorg-server, p-cpe:/a:canonical:ubuntu_linux:xorg-server, p-cpe:/a:centos:centos:xorg-x11-server-xdmx, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xdmx, p-cpe:/a:centos:centos:xorg-x11-server-xnest, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xnest, p-cpe:/a:centos:centos:xorg-x11-server-devel, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-devel, p-cpe:/a:centos:centos:xorg-x11-server-source, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-source, p-cpe:/a:centos:centos:tigervnc-server-module, p-cpe:/a:redhat:enterprise_linux:tigervnc-server-module, p-cpe:/a:redhat:enterprise_linux:tigervnc-server-applet, p-cpe:/a:centos:centos:tigervnc-server-applet, p-cpe:/a:canonical:ubuntu_linux:xwayland, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server, p-cpe:/a:centos:centos:xorg-x11-server, p-cpe:/a:debian:debian_linux:xwayland, p-cpe:/a:redhat:enterprise_linux:tigervnc-selinux, p-cpe:/a:centos:centos:tigervnc-selinux, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:xorg-server-hwe-16.04, p-cpe:/a:canonical:ubuntu_linux:xorg-server-hwe-18.04, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:26.04:-:lts

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2026-50263