Fedora 43 Xen Critical DoS Vulnerabilities via XS_RESET_WATCHES Exploit
fedora
May 1, 2026
oxenstored keeps quota related use counts across domain destruction [XSA-483, CVE-2026-23556] Xenstored DoS via XS_RESET_WATCHES command [XSA-484, CVE-2026-23557] grant table v2 ra...
Summary
This package contains the XenD daemon and xm command line
tools, needed to manage virtual machines running under the
Xen hypervisor
Update Information:
oxenstored keeps quota related use counts across domain destruction [XSA-483, CVE-2026-23556] Xenstored DoS via XS_RESET_WATCHES command [XSA-484, CVE-2026-23557] grant table v2 race in status page mapping [XSA-486, CVE-2026-23558] x86: Floating Point Divider State Sampling [XSA-488, CVE-2025-54505]
Topics Covered
Change Log
* Wed Apr 29 2026 Michael Young
References
Fedora Update Notification
FEDORA-2026-78cd69d9ae
2026-05-01 03:01:50.286568+00:00
Name : xen
Product : Fedora 43
Version : 4.20.3
Release : 2.fc43
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-2026-78cd69d9ae' 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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Name: xen
Product: Fedora 43
Version: 4.20.3
Release: 2.fc43
URL: http://xen.org/
Summary: Xen is a virtual machine monitor
Topics Covered
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