This bug is awaiting verification that the linux-azure/5.15.0-1072.81
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-jammy-linux-azure' to 'verification-done-jammy-
linux-azure'. If the problem still exists, change the tag 'verification-
needed-jammy-linux-azure' to 'verification-failed-jammy-linux-azure'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-azure-v2 
verification-needed-jammy-linux-azure

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Packages, which is subscribed to linux-azure in Ubuntu.
https://bugs.launchpad.net/bugs/2076291

Title:
  kernel panic was caused by a fatal exception due to a null pointer
  dereference in the iptable_nat module

Status in linux-azure package in Ubuntu:
  New
Status in linux-azure source package in Jammy:
  Fix Committed

Bug description:
  [Impact]

  * Microsoft has requested a patch to address a kernel panic issue
  similar to the upstream issue here -
  
https://patchwork.kernel.org/project/netdevbpf/patch/20240731213046.6194-2-pa...@netfilter.org/

  [Fix]

  * Clean cherry-pick upstream commit 5830aa863981: "netfilter:
  iptables: Fix null-ptr-deref in iptable_nat_table_init()"

  [Test Plan]

  * Build and boot tested

  [Where problems could occur]

  * Low regression risk, mostly shifting logic
  * Change to order of register_pernet_subsys() and xt_register_template() 
could expose some other logic being held together under race condition

  [Other info]

  * SF #00391736

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