Fedora 42 Xen Serious Buffer Overrun Issue and vCPU Isolation XSA-477
fedora
February 15, 2026
x86: buffer overrun with shadow paging + tracing [XSA-477, CVE-2025-58150] x86: incomplete IBPB for vCPU isolation [XSA-479, CVE-2026-23553]
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: buffer overrun with shadow paging + tracing [XSA-477, CVE-2025-58150] x86: incomplete IBPB for vCPU isolation [XSA-479, CVE-2026-23553]
Topics Covered
Change Log
* Thu Jan 29 2026 Michael Young
References
[ 1 ] Bug #2434045 - CVE-2025-58150 xen: x86: buffer overrun with shadow paging + tracing [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2434045
[ 2 ] Bug #2434047 - CVE-2026-23553 xen: x86: incomplete IBPB for vCPU isolation [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2434047
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-e39149a8a0' 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 42
Version: 4.19.4
Release: 2.fc42
Summary: Xen is a virtual machine monitor
Topics Covered
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