RHEL 10 : xorg-x11-server-Xwayland (RHSA-2026:38489)

critical Nessus Plugin ID 326463

Synopsis

The remote Red Hat host is missing one or more security updates for xorg-x11-server-Xwayland.

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:38489 advisory.

Xwayland is an X server for running X clients under Wayland.

Security Fix(es):

* xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow (CVE-2026-55999)

* X.org: xorg-x11-server: GLX contextTags Use-After-Free in CommonMakeCurrent() (CVE-2026-56000)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL xorg-x11-server-Xwayland packages based on the guidance in RHSA-2026:38489.

Plugin Details

Severity: Critical

ID: 326463

File Name: redhat-RHSA-2026-38489.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 7/13/2026

Updated: 7/13/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.1

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-56000

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9

Threat Score: 6.1

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xwayland, p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-xwayland-devel, cpe:/o:redhat:enterprise_linux:10.2

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 7/13/2026

Vulnerability Publication Date: 7/8/2026

Reference Information

CVE: CVE-2026-55999, CVE-2026-56000

CWE: 805, 825

RHSA: 2026:38489

Detections

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