linux-kernel - Re: general protection fault in __fib6_drop_pcpu

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Message-ID: <CAG_fn=Wh-Z12SaBNgXJNqKyfODwxUAYJqyc86hguXn2M2Fv=nA@mail.gmail.com>
Date: Wed, 12 Feb 2025 18:28:36 +0100
From: Alexander Potapenko <glider@...gle.com>
To: YAN KANG <kangyan91@...look.com>
Cc: "David S. Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Simon Horman <horms@...nel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"syzkaller@...glegroups.com" <syzkaller@...glegroups.com>
Subject: Re: general protection fault in __fib6_drop_pcpu_from [CVE-2024-40905
 Incomplete fix]

On Tue, Feb 4, 2025 at 5:27 AM YAN KANG <kangyan91@...look.com> wrote:
>
> Dear developers and maintainers,
>
> I found a new kernel UAF  bug titiled "general protection fault in __fib6_drop_pcpu_from" while using modified syzkaller fuzzing tool. I Itested it on the latest Linux upstream version (6.13.0-rc1), and it was able to be triggered many times .
>
I was running an unmodified syzkaller build today for a different
reason, and came across this bug within 40 minutes of fuzzing.
Just giving you a heads-up for the case you will be evaluating the
fuzzer modifications.