A xen security update has been released for Fedora 35.

SECURITY: Fedora 35 Update: xen-4.15.3-4.fc35

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Fedora Update Notification
FEDORA-2022-a0d7a5eaf2
2022-08-12 01:41:01.346951
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Name : xen
Product : Fedora 35
Version : 4.15.3
Release : 4.fc35
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:

insufficient TLB flush for x86 PV guests in shadow mode [XSA-408,
CVE-2022-33745] ---- Retbleed - arbitrary speculative code execution with
return instructions [XSA-407, CVE-2022-23816, CVE-2022-23825, CVE-2022-29900]
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ChangeLog:

* Tue Jul 26 2022 Michael Young - 4.15.3-4
- insufficient TLB flush for x86 PV guests in shadow mode [XSA-408,
CVE-2022-33745]
* Fri Jul 22 2022 Michael Young - 4.15.3-3
- Retbleed - arbitrary speculative code execution with return instructions
[XSA-407, CVE-2022-23816, CVE-2022-23825, CVE-2022-29900]
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References:

[ 1 ] Bug #2112222 - CVE-2022-33745 xen: insufficient TLB flush for x86 PV guests in shadow mode
  https://bugzilla.redhat.com/show_bug.cgi?id=2112222
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2022-a0d7a5eaf2' 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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