linux-kernel - Re: CVE-2024-35840: mptcp: use OPTION_MPTCP_MPJ_SYNACK in subflow_finish

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Message-ID: <ZnAg4ndsrYCuqN6j@tiehlicka>
Date: Mon, 17 Jun 2024 13:41:22 +0200
From: Michal Hocko <mhocko@...e.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: cve@...nel.org, linux-kernel@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	linux-cve-announce@...r.kernel.org
Subject: Re: CVE-2024-35840: mptcp: use OPTION_MPTCP_MPJ_SYNACK in
 subflow_finish_connect()

On Mon 17-06-24 13:31:13, Greg KH wrote:
> On Mon, Jun 17, 2024 at 01:28:05PM +0200, Michal Hocko wrote:
> > On Thu 06-06-24 10:03:59, Michal Hocko wrote:
> > > Hi,
> > > what is the actual security threat here? As far as I can see, the
> > > problem that the commit requested here addresses seems to be rather
> > > functional, rather than responding to an unexpected packet options with
> > > a reset, we actually establish a connection with some garbage parameters
> > > (likely unpredictable). Which is unfortunate but I do not see any
> > > security implications.
> > 
> > Does the silence mean that there are no actual security implications
> > here?
> 
> Sorry, no, I was traveling and am still trying to catch up with the
> pending queue.  Should get to it later today or tomorrow, sorry for the
> delay.

Thanks!

-- 
Michal Hocko
SUSE Labs