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

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Message-ID: <2024061750-glade-overstep-7759@gregkh>
Date: Mon, 17 Jun 2024 17:43:10 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Michal Hocko <mhocko@...e.com>
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 Thu, Jun 06, 2024 at 10:03:54AM +0200, 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.

Sorry for the delay.  I'm pretty sure this is a data leak as the
"garbage" is coming from other kernel data, and as such, was reviewed by
us as a vulnerability.

Do you not see it as such?

thanks,

greg k-h