Fedora 44 Xen 4.21.1 Release Advisory XSA-480 DoS CVE-2026-23554
fedora
March 31, 2026
update to xen 4.21.1 Use after free of paging structures in EPT [XSA-480, CVE-2026-23554] Xenstored DoS by unprivileged domain [XSA-481, CVE-2026-23555]
Summary
This package contains the XenD daemon and xm command line
tools, needed to manage virtual machines running under the
Xen hypervisor
Update Information:
update to xen 4.21.1 Use after free of paging structures in EPT [XSA-480, CVE-2026-23554] Xenstored DoS by unprivileged domain [XSA-481, CVE-2026-23555]
Topics Covered
Change Log
* Thu Mar 26 2026 Michael Young
References
[ 1 ] Bug #2415748 - xen-4.21.1 is available
https://bugzilla.redhat.com/show_bug.cgi?id=2415748
[ 2 ] Bug #2450273 - CVE-2026-23554 xen: Xen: Information disclosure and potential privilege escalation via use-after-free in EPT paging [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2450273
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-f884fd0313' 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
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Severity
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Name: xen
Product: Fedora 44
Version: 4.21.1
Release: 1.fc44
URL: http://xen.org/
Summary: Xen is a virtual machine monitor
Topics Covered
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