Public bug reported:

[Impact]

The last merge of the v5.15 stable (see
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2003134) has
introduced a bug on netlink netfilter conntrack messages.

The problematic commit is 95fcb42e5f20 ("netfilter: ctnetlink: fix compilation 
warning after data race fixes in ct mark"):
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy/commit/?id=95fcb42e5f20

This bug has been fixed in upstream commit 9f7dd42f0db1 ("netfilter: ctnetlink: 
revert to dumping mark regardless of event type"):
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9f7dd42f0db1

which has been backported in v5.15.103:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=bef8cf77e21c

[Test Case]

Run 'conntrack -E' and check the output.

Before the problematic commit:
> tcp      6 2 ESTABLISHED src=10.100.0.1 dst=10.200.0.1 sport=6789 dport=12345 
> src=10.200.0.1 dst=10.100.0.1 sport=12345 dport=6789 [ASSURED] mark=0 use=1

'mark=' is seen on connrtack event

after:
> tcp      6 2 ESTABLISHED src=10.100.0.1 dst=10.200.0.1 sport=6789 dport=12345 
> src=10.200.0.1 dst=10.100.0.1 sport=12345 dport=6789 [ASSURED] use=1

=> 'mark=' is not seen.

[Regression Potential]

The patch is quite simple. It has been backported in the official 5.15
stable. The risk of regression should be contained.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2016269

Title:
  conntrack mark is not advertised via netlink

Status in linux package in Ubuntu:
  New

Bug description:
  [Impact]

  The last merge of the v5.15 stable (see
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2003134) has
  introduced a bug on netlink netfilter conntrack messages.

  The problematic commit is 95fcb42e5f20 ("netfilter: ctnetlink: fix 
compilation warning after data race fixes in ct mark"):
  
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy/commit/?id=95fcb42e5f20

  This bug has been fixed in upstream commit 9f7dd42f0db1 ("netfilter: 
ctnetlink: revert to dumping mark regardless of event type"):
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9f7dd42f0db1

  which has been backported in v5.15.103:
  
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=bef8cf77e21c

  [Test Case]

  Run 'conntrack -E' and check the output.

  Before the problematic commit:
  > tcp      6 2 ESTABLISHED src=10.100.0.1 dst=10.200.0.1 sport=6789 
dport=12345 src=10.200.0.1 dst=10.100.0.1 sport=12345 dport=6789 [ASSURED] 
mark=0 use=1

  'mark=' is seen on connrtack event

  after:
  > tcp      6 2 ESTABLISHED src=10.100.0.1 dst=10.200.0.1 sport=6789 
dport=12345 src=10.200.0.1 dst=10.100.0.1 sport=12345 dport=6789 [ASSURED] use=1

  => 'mark=' is not seen.

  [Regression Potential]

  The patch is quite simple. It has been backported in the official 5.15
  stable. The risk of regression should be contained.

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