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Date: Thu, 11 May 2023 03:56:44 +0200
From: Solar Designer <>
To: Piotr Krysiuk <>
Cc: Turritopsis Dohrnii Teo En Ming <>,,
Subject: Re: New Linux kernel NetFilter flaw gives attackers root privileges

On Wed, May 10, 2023 at 08:02:49PM +0100, Piotr Krysiuk wrote:
> On Wed, May 10, 2023 at 5:55???PM Solar Designer <> wrote:
> > Is the netfilter issue really worse than the io_uring issue?  I doubt
> > it.  So _maybe_ it was something in the wording that tripped someone
> > writing for one of those tech news websites, then others picked it up?

When writing the above, I didn't recall that the io_uring issue is
6.3-only, which does make it relatively less important.

Brad Spengler reminded me of this aspect on Twitter.  Thanks.

> I suspect that what triggered the media is the following fragment:
> > Somebody from the Linux kernel team then emailed the proposed fix to
> > <> and that email also included a link to
> > download our description of exploitation techniques and our exploit
> > source code.
> >
> > Therefore, according to the linux-distros list policy, the exploit must
> > be published within 7 days from this advisory.

Oh, that could have looked like drama.  Yes, that could be it.

> So in the advisory I wanted to explain the reason why the exploit must
> be posted, given that was not my original plan.

Sure.  I think this is good for transparency.

> > As expected.  Now, from a typical distro user's standpoint,
> > "unprivileged local users" may be just right.  However, not all distros
> > have unprivileged user namespaces enabled by default.
> You are right, I should have explained the dependencies. Do you think
> it would be OK to include the correction on Monday? Or is it better to
> send today (it may catch even more media)? I will make sure to review
> the wording with you before posting.

We're already having this very discussion on the list, just not in the
same thread... and I just realized that maybe you didn't realize that.

When you post the exploitation techniques and the exploit code on
Monday, please do explain the dependencies in that same message.



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