The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:84574 advisory.

    X.Org is an open-source implementation of the X Window System. It provides the basic low-level     functionality that full-fledged graphical user interfaces are designed upon.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server: Arbitrary code execution via use-after-free in passive grab handling     (CVE-2026-93516)

    * xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer     overflow (CVE-2026-93517)

    * xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard     mapping resize (CVE-2026-93518)

    * xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in     input_constrain_cursor() (CVE-2026-93519)

    * xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode     handling (CVE-2026-93520)

    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.

Detections

Analytics

RHEL 9 : xorg-x11-server (RHSA-2026:84574)

high Nessus Plugin ID 367210

Version 1.5

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.5 Nov 6, 2026, 9:10 PM Plugin metadata (Add IAVM Info) Plugin Feed: 202611062110
Version 1.4 Oct 30, 2026, 9:10 PM Plugin metadata (Add IAVM Info) Plugin Feed: 202610302110
Version 1.3 Oct 29, 2026, 3:00 PM CVSS metrics ("Cvssv4 score" set to 8.5) CVSS metrics ("Cvssv4 threat vector" set to "CVSS:4.0/E:U") CVSS metrics ("Cvssv4 vector" set to "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N") Plugin Feed: 202610291500
Version 1.2 Oct 26, 2026, 2:57 PM Detection (updated detection logic) Plugin Feed: 202610261457
Version 1.1 Oct 19, 2026, 10:23 AM New Plugin Feed: 202610191023