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Fedora Update Notification
FEDORA-2026-e39149a8a0
2026-02-15 01:28:07.972869+00:00
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Name        : xen
Product     : Fedora 42
Version     : 4.19.4
Release     : 2.fc42
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

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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]
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ChangeLog:

* Thu Jan 29 2026 Michael Young <[email protected]> - 4.19.4-2
x86: buffer overrun with shadow paging + tracing [XSA-477, CVE-2025-58150]
        (#2434045)
  x86: incomplete IBPB for vCPU isolation [XSA-479, CVE-2026-23553]
        (#2434047)
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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
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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

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
https://fedoraproject.org/keys
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