Security Bulletin: Vulnerabilities in xorg-x11-server library (CVE-2026-50256, CVE-2026-50257, CVE-2026-50258, CVE-2026-50264, CVE-2026-59083, CVE-2026-55999) affect Power HMC.

Summary The xorg-x11-server is used by Power Hardware Management Console HMC. HMC has addressed the applicable CVEs. Vulnerability Details CVEID:CVE-2026-55999 DESCRIPTION: Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: xorg-x11-server (UTSA-2023-000014)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2023-000014 advisory. A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: xorg-x11-server (UTSA-2026-054038)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-054038 advisory. A flaw was found in the Xorg-x11-server. The specific flaw exists within the handling of ProcXkbSetDeviceInfo requests. The issue results from the lack of proper...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: xorg-x11-server (UTSA-2023-000009)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2023-000009 advisory. A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIChangeProperty request has a length-validation issues, resulting in...

EulerOS 2.0 SP10 : xorg-x11-server (EulerOS-SA-2026-3775)

According to the versions of the xorg-x11-server packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter. A client that sets up multiple SyncCounters and awaits...

EulerOS 2.0 SP10 : xorg-x11-server (EulerOS-SA-2026-3728)

According to the versions of the xorg-x11-server packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter. A client that sets up multiple SyncCounters and awaits...

Astra Linux – Vulnerability in xorg-server

A flaw was discovered in xorg-x11-server in versions prior to 21.1.2 and prior to 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The greatest threat posed by this vulnerability is related to data confidentiality and integrity, as well as system availability...

EulerOS 2.0 SP12 : xorg-x11-server (EulerOS-SA-2026-3320)

According to the versions of the xorg-x11-server packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized...

NewStart CGSL MAIN 7.02 : xorg-x11-server Vulnerability (NS-SA-2026-0102)

The remote NewStart CGSL host, running version MAIN 7.02, has xorg-x11-server packages installed that are affected by a vulnerability: - A flaw was found in the X.org server. Due to improperly tracked allocation size in XkbSetCompatMap, a local attacker may be able to trigger a buffer overflow...

EulerOS 2.0 SP12 : xorg-x11-server (EulerOS-SA-2026-3395)

According to the versions of the xorg-x11-server packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized...

NewStart CGSL MAIN 7.02 : xorg-x11-server-Xwayland Vulnerability (NS-SA-2026-0112)

The remote NewStart CGSL host, running version MAIN 7.02, has xorg-x11-server-Xwayland packages installed that are affected by a vulnerability: - A flaw was found in the X.org server. Due to improperly tracked allocation size in XkbSetCompatMap, a local attacker may be able to trigger a buffer...

Oracle Linux 9 : xorg-x11-server-Xwayland (ELSA-2026-38490)

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-38490 advisory. 24.1.9-4.3 - CVE fix for: CVE-2026-55999, CVE-2026-56000 Resolves: https://redhat.atlassian.net/browse/RHEL-191532 Resolves:...

Oracle Linux 8 : xorg-x11-server (ELSA-2026-38487)

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-38487 advisory. 1.20.11-28.3 - CVE fix for CVE-2026-55999 Resolves: https://redhat.atlassian.net/browse/RHEL-191504 Tenable has extracted the preceding description block...

Oracle Linux 10 : xorg-x11-server-Xwayland (ELSA-2026-38489)

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-38489 advisory. 24.1.9-4.3 - CVE fix for: CVE-2026-55999, CVE-2026-56000 Resolves: https://redhat.atlassian.net/browse/RHEL-191518 Resolves:...

xorg-x11-server-Xwayland security update

24.1.9-4.3 - CVE fix for: CVE-2026-55999, CVE-2026-56000 Resolves: https://redhat.atlassian.net/browse/RHEL-191532 Resolves: https://redhat.atlassian.net/browse/RHEL-191524...

xorg-x11-server-Xwayland security update

24.1.9-4.3 - CVE fix for: CVE-2026-55999, CVE-2026-56000 Resolves: https://redhat.atlassian.net/browse/RHEL-191518 Resolves: https://redhat.atlassian.net/browse/RHEL-191517...

xorg-x11-server security update

1.20.11-28.3 - CVE fix for CVE-2026-55999 Resolves: https://redhat.atlassian.net/browse/RHEL-191504...

Oracle Linux 7 : ELSA-2026-50117-0: / xorg-x11-server (ELSA-2026-501170)

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-501170 advisory. - Security update for CVE-2026-55999 Orabug: 39831768 - Security update for CVE-2026-50256 CVE-2026-50257 CVE-2026-50258 CVE-2026-50259 CVE-2026-50260...

xorg-x11-server security update

1.20.4-29.0.11 - Security update for CVE-2026-55999 Orabug: 39831768 1.20.4-29.0.9 - Security update 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 Orabug: 39695293 Tue Jun 09 2026 Ronan Pigott 1.20.4-29.0...

Oracle Linux 7 : xorg-x11-server (ELSA-2026-36083)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-36083 advisory. - Security update 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...