A user on #ubuntu-server reported being affected by this bug as well but
on Focal with the HWE kernel 5.15. I'm not sure how to do verification
in such case? Should they manually pull the .deb from jammy-proposed or
will there be a HWE kernel built for focal-proposed?

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https://bugs.launchpad.net/bugs/2002889

Title:
  5.15.0-58.64 breaks xen bridge networking (pvh domU)

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Focal:
  Fix Committed
Status in linux source package in Jammy:
  Fix Committed
Status in linux source package in Kinetic:
  Fix Committed

Bug description:
  [Impact]                                                                      
                                                                                
                                                       
  Xen guests will not have network access. This fixes a regression due to the 
fix                                                                             
                                                         
  for CVE-2022-3643.                                                            
                                                                                
                                                       
                                                                                
                                                                                
                                                       
  [Testing]                                                                     
                                                                                
                                                       
  This has only been build-tested.                                              
                                                                                
                                                       
                                                                                
                                                                                
                                                       
  [Potential regression]                                                        
                                                                                
                                                       
  Xen guests might not have network access.
  ----------------------------------------------------------------------


  With 5.15.0-58.64-generic, bridge networking on xen is broken :

   no packet (check with tcpdump)  flowing between dom0 and any domUs 
  attached to a network bridge.
   downgrading to  5.15.0-57-generic fix the issue. Thus the patch to the 
netback driver seems the cause.

  relevant network config :

  brtctl show :
  br0           8000.XXXXXXXXXXX        no              eno1
         vif1.0

  relevant domU config :

  kernel = '/usr/lib/grub-xen/grub-i386-xen_pvh.bin'
  type = 'pvh'

  vif         = [ 'ip=192.168.10.10 ,bridge=br0' ]

  No message in dmesg, journal, xen logs..

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