XenServer Security Update for CVE-2026-4397

Severity: Medium Description of Problem An issue has been identified in XenServer 8.4 which, when starting a VM on a host with limited available memory, may allow a privileged user in that newly starting VM to access memory data of a previously terminated VM. This issue has the following...

XenServer Security Update for CVE-2025-58151 and CVE-2026-23553

Severity:Medium Description of Problem An issue has been identified in XenServer 8.4 that may allow privileged code in a guest VM to cause the host to become slow or unresponsive to management operations. This issue has the following identifier: CVE-2025-58151 A further issue has been identified ...

XenServer Security Update for CVE-2025-62626

Severity: Medium Description of Problem A hardware issue has been identified in AMD Zen 5 CPU devices that may cause those CPUs to return a value of zero more frequently than statistically expected when asked to generate a random value. This may compromise e.g. cryptographic keys that are generat...

XenServer Security Update for CVE-2025-58147 and CVE-2025-58148

Severity: High Description of Problem Several issues have been identified in XenServer 8.4 that may allow privileged code in a guest VM to compromise or crash the host. These issues have the following identifiers: CVE-2025-58147 CVE-2025-58148 Affected Versions These issues affect XenServer 8.4...

XenServer Security Update for CVE-2025-27465

Severity: Medium Description of Problem An issue has been identified in XenServer 8.4 that may allow privileged code in a guest VM to cause the host to crash or become unresponsive. This issue has the following identifier: CVE-2025-27465 Affected Versions This issue affects XenServer 8.4. Note th...

Prepare for Citrix Hypervisor 8.2 Cumulative Update 1 End of Life

Citrix Hypervisor 8.2 Cumulative Update 1becomes End of Life onJune 25, 2025. Plan to upgrade to XenServer 8.4 before this date. For more information about XenServer 8.4, see What's New. Key changes in XenServer 8.4 Licensing Only XenServer Premium Edition socket licenses are supported with...