linux-kernel - Re: Subject: [SECURITY] Vulnerability in Linux Kernel

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Date: Thu, 30 May 2024 07:19:02 +0200
From: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To: Kuzey Arda Bulut <kuzeyb.business@...il.com>
Cc: security@...nel.org, jirislaby@...nel.org, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: Subject: [SECURITY] Vulnerability in Linux Kernel

On Wed, May 29, 2024 at 08:25:18PM +0300, Kuzey Arda Bulut wrote:
> Dear Linux Kernel Security Team,
> 
> I have discovered a null-ptr-deref security vulnerability in tty driver in
> the Linux kernel. You can find the detailed descriptions of the
> vulnerability in report.md.
> 
> If you have any questions or need further information, please do not
> hesitate to contact me.

As the n_gsm is full of known issues by the developers, and the ldisc is
not allowed to be loaded by a non-root user, this isn't all that serious
of an issue.  See this thread for a list of problems that I think you
might have already found here:
	https://lore.kernel.org/r/DB9PR10MB5881D2170678C169FB42A423E0082@DB9PR10MB5881.EURPRD10.PROD.OUTLOOK.COM

Note, 2 fixes have landed in 6.10-rc2 for this driver, can you verify if
these fix the issue you are reporting here?

And do you have a proposed fix for this issue?

thanks,

greg k-h