Important: Red Hat Security Advisory: xorg-x11-server security update

An update for xorg-x11-server is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerabilit...

Important: Red Hat Security Advisory: xorg-x11-server-Xwayland security update

An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each...

xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow

A flaw was found in the glamorfontget function of the xorg-x11-server. This vulnerability, a heap buffer overflow, occurs when the server processes a specially crafted PCF font file where individual glyph metrics exceed the declared maximum bounds. An authenticated X client can exploit this by...

Important: Red Hat Security Advisory: xorg-x11-server-Xwayland security update

An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each...

xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat

An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for...

Important: Red Hat Security Advisory: xorg-x11-server-Xwayland security update

An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security has rated this update as having a security impact of Important. A Common...

xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()

A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence. A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection...

RHEL 8 : xorg-x11-server-Xwayland (RHSA-2026:38810)

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:38810 advisory. Xwayland is an X server for running X clients under Wayland. Security Fixes: xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server:...

RHEL 9 : xorg-x11-server (RHSA-2026:38486)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:38486 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...

AlmaLinux 8 : xorg-x11-server-Xwayland (ALSA-2026:38488)

The remote AlmaLinux 8 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:38488 advisory. xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow CVE-2026-55999 Tenable has extracted the preceding description block directly from the AlmaLinux...

Important: xorg-x11-server security update

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 Fixes: xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow CVE-2026-55999 For more details about the...

AlmaLinux 8 : xorg-x11-server (ALSA-2026:38487)

The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:38487 advisory. xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow CVE-2026-55999 Tenable has extracted the preceding description block directly from the AlmaLinux...

ALSA-2026:38487 Important: xorg-x11-server security update

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 Fixes: xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow CVE-2026-55999 For more details about the...

Oracle Linux 9 : xorg-x11-server (ELSA-2026-38486)

The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-38486 advisory. 1.20.11-34.3 - CVE fix for CVE-2026-55999 Resolves: https://redhat.atlassian.net/browse/RHEL-191493 Tenable has extracted the preceding description block...

xorg-x11-server-Xwayland security update

21.1.3-20.3 - CVE fix for: CVE-2026-55999 Resolves: https://redhat.atlassian.net/browse/RHEL-191516...

openSUSE 16: xorg-x11-server / xorg-x11-server-Xvfb / xorg-x11-server-extra / etc (openSUSE-SU-2026:21273-1)

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21273-1 advisory. This update for xorg-x11-server fixes the following issues - CVE-2026-55999: missing bounds check in glamorfontget can lead to a heap buffer...

RHEL 8 : xorg-x11-server (RHSA-2026:38487)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:38487 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...

ALSA-2026:38486 Important: xorg-x11-server security update

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 Fixes: xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow CVE-2026-55999 For more details about the...

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

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 Fixes: xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer...

CVE-2026-56000 affecting package xorg-x11-server-Xwayland for versions less than 24.1.13-1

CVE-2026-56000 affecting package xorg-x11-server-Xwayland for versions less than 24.1.13-1. An upgraded version of the package is available that resolves this issue...