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Alerts This Week
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Fedora 44 Xen Critical Security Issues Update 2026-24b84f97af

fedora
Calendar Grey June 17, 2026
Scroller Fedora
Critical security advisory for Fedora 44 addressing multiple Xen issues including potential DoS attacks. Act now!
x86 HVM I/O port list traversal [XSA-491, CVE-2026-42487] domctl lock open to abuse [XSA-492, CVE-2026-42489, CVE-2026-42490] Arm: Completion of memory accesses not guaranteed by c...

Summary

This package contains the XenD daemon and xm command line

tools, needed to manage virtual machines running under the

Xen hypervisor

Update Information:

x86 HVM I/O port list traversal [XSA-491, CVE-2026-42487] domctl lock open to abuse [XSA-492, CVE-2026-42489, CVE-2026-42490] Arm: Completion of memory accesses not guaranteed by completion of a TLBI [XSA-493, CVE-2025-10263] x86: mismatched mapcache metadata [XSA-494, CVE-2026-42488]

Topics%20covered

Topics Covered

security advisory denial of service fedora critical xen

Change Log

* Fri Jun 12 2026 Michael Young - 4.21.1-4 - x86 HVM I/O port list traversal [XSA-491, CVE-2026-42487] - domctl lock open to abuse [XSA-492, CVE-2026-42489, CVE-2026-42490] - Arm: Completion of memory accesses not guaranteed by completion of a TLBI [XSA-493, CVE-2025-10263] - x86: mismatched mapcache metadata [XSA-494, CVE-2026-42488]

References

Fedora Update Notification FEDORA-2026-24b84f97af 2026-06-17 08:41:51.002515+00:00 Name : xen Product : Fedora 44 Version : 4.21.1 Release : 4.fc44 URL : http://xen.org/ Summary : Xen is a virtual machine monitor Description : This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-24b84f97af' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

Severity
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Critical

Name: xen
Product: Fedora 44
Version: 4.21.1
Release: 4.fc44
URL: http://xen.org/
Summary: Xen is a virtual machine monitor

Topics%20covered

Topics Covered

security advisory denial of service fedora critical xen

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