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Date: Mon, 10 May 2021 08:10:53 +0200
From: Salvatore Bonaccorso <carnil@...ian.org>
To: Alex Murray <alex.murray@...onical.com>
Cc: oss-security@...ts.openwall.com,
	Nadav Markus <nmarkus@...oaltonetworks.com>,
	Or Cohen <orcohen@...oaltonetworks.com>
Subject: Re: CVE-2021-23133: Linux kernel: race condition in
 sctp sockets

Hi Alex,

On Mon, May 10, 2021 at 03:28:02PM +0930, Alex Murray wrote:
> 
> On Mon, 2021-05-10 at 13:54:43 +0930, Salvatore Bonaccorso wrote:
> 
> > Hi,
> > 
> > On Sun, Apr 18, 2021 at 11:41:06AM +0300, Or Cohen wrote:
> > > Hello,
> > > 
> > > This is an announcement about CVE-2021-23133 which is a race-condition
> > > I found in Linux kernel sctp sockets (net/sctp/socket.c). It can
> > > lead to kernel
> > > privilege escalation from the context of a network service or from
> > > an unprivileged process if certain conditions are met.
> > > 
> > > The bug was fixed on April 13, 2021:
> > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b
> > 
> > It looks that additionally
> > https://git.kernel.org/linus/34e5b01186858b36c4d7c87e1a025071e8e2401f
> > refer to CVE-2021-23133.
> 
> It seems b166a20b07382b8bc1dcee2a448715c9c2c81b5b got reverted in the
> follow-up commit
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/sctp/socket.c?id=01bfe5e8e428b475982a98a46cca5755726f3f7f
> and so 34e5b01186858b36c4d7c87e1a025071e8e2401f would appear to be the
> most correct fix from what I can tell.

Ah right, I missed the revert of the original commit.

Thanks for pointing that to me.

Regards,
Salvatore

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