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

A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter. A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or f...

RHEL 8 : tigervnc (RHSA-2026:28923)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:28923 advisory. Virtual Network Computing VNC is a remote display system which allows users to view a computing desktop environment not only on the machine...

Oracle Linux 9 : tigervnc (ELSA-2026-19342)

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-19342 advisory. - Fix CVE-2026-33999, CVE-2026-34000, CVE-2026-34001, CVE-2026-34002, CVE-2026-34003 xorg-x11-server: various XKB and XSYNC vulnerabilities Resolves:...

Important: tigervnc security update

Virtual Network Computing VNC is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients...

tigervnc security update

1.15.0-10 - Rebuild for updated xorg-x11-server Resolves: RHEL-183998...

Oracle Linux 8 : tigervnc (ELSA-2026-28923)

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-28923 advisory. 1.15.0-10 - Rebuild for updated xorg-x11-server Resolves: RHEL-183998 Tenable has extracted the preceding description block directly from the Oracle...

ALSA-2026:28923 Important: tigervnc security update

Virtual Network Computing VNC is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients...

AZL-91197 CVE-2026-55655 affecting package openssh 9.8p1-10

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack ca...

UBUNTU-CVE-2026-55655

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack ca...

CVE-2026-55655 Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack ca...

CVE-2026-55655 Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack ca...

PT-2026-51473

Name of the Vulnerable Software and Affected Versions OpenSSH affected versions not specified Description A flaw in OpenSSH allows a local unprivileged attacker on a Linux client host to hijack client-side X11 forwarding connections. This occurs when X11 forwarding is enabled and a local...

xorg-x11-server security, bug fix, and enhancement update

1.20.11-34.2 - Other security related fixes Resolves: https://redhat.atlassian.net/browse/RHEL-184288 1.20.11-34.1 - CVE fix for: CVE-2026-50256, CVE-2026-50257, CVE-2026-50258, CVE-2026-50259, CVE-2026-50260, CVE-2026-50261, CVE-2026-50262, CVE-2026-50263, CVE-2026-50264 Resolves:...

Linux Distros Unpatched Vulnerability : CVE-2026-55655

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by...

Important: Red Hat Security Advisory: xorg-x11-server-Xwayland security, bug fix, and enhancement 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...

RockyLinux 8 : xorg-x11-server-Xwayland (RLSA-2026:26562)

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:26562 advisory. xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch...

RHEL 9 : xorg-x11-server (RHSA-2026:26610)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:26610 advisory. X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical us...

Oracle Linux 8 : xorg-x11-server (ELSA-2026-26709)

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-26709 advisory. 1.20.11-28.2 - Other security related fixes Resolves: https://redhat.atlassian.net/browse/RHEL-184289 1.20.11-28.1 - CVE fix for: CVE-2026-50256,...

MiracleLinux 8 : xorg-x11-server-Xwayland-21.1.3-20.el8_10.2 (AXSA:2026-805:03)

The remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2026-805:03 advisory. xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch...

Oracle Linux 8 : xorg-x11-server-Xwayland (ELSA-2026-26562)

The remote Oracle Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2026-26562 advisory. 21.1.3-20.2 - Other security related fixes Resolves: https://redhat.atlassian.net/browse/RHEL-184293 21.1.3-20.1 - CVE fix for: CVE-2026-50256,...