CVE-2026-23556

creationtimestamp| type| source ---|---|--- 2026-04-29 01:49:24+00:00| seen| https://www.acn.gov.it/portale/w/risolte-vulnerabilita-in-citrix-xenserver 2026-04-29 12:45:35+00:00| seen| https://bsky.app/profile/o2cloud.bsky.social/post/3mkn4wpcktx2h 2026-04-29 12:50:07+00:00| seen|...

XenServer Security Update for Multiple Issues

Severity: High Description of Problem Several issues have been identified that affect XenServer 8.4. These are: An issue that may, in some circumstances, allow a malicious privileged user in a guest VM to compromise the host. This issue has the following identifier: CVE-2026-23558 An issue that m...

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-2026-23554

Severity: High Description of Problem An issue has been identified in XenServer 8.4 that may allow privileged code in a guest VM to compromise the host. This issue has the following identifier: CVE-2026-23554 Affected Versions This issue affects XenServer 8.4. Note that XenServer 9.0 is in Public...

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 ...

PT-2026-26014

Name of the Vulnerable Software and Affected Versions Citrix XenServer version 8.4 Description The Intel EPT paging code includes an optimization that defers flushing of cached EPT state until the p2m lock is released. However, the freeing of paging structures is not deferred, potentially leading...

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...

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