linux-kernel - Re: CVE-2023-52656: io_uring: drop any code related to SCM

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Message-ID: <d1cb0cd3-0826-48fc-8713-8648d6eb9fd7@kernel.dk>
Date: Fri, 24 May 2024 10:57:07 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Gabriel Krisman Bertazi <krisman@...e.de>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-cve-announce@...r.kernel.org, cve@...nel.org,
 linux-kernel@...r.kernel.org
Subject: Re: CVE-2023-52656: io_uring: drop any code related to SCM_RIGHTS

On 5/24/24 10:45 AM, Gabriel Krisman Bertazi wrote:
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:
> 
>> Description
>> ===========
>>
>> In the Linux kernel, the following vulnerability has been resolved:
>>
>> io_uring: drop any code related to SCM_RIGHTS
>>
>> This is dead code after we dropped support for passing io_uring fds
>> over SCM_RIGHTS, get rid of it.
>>
>> The Linux kernel CVE team has assigned CVE-2023-52656 to this issue.
> 
> Hello Greg,
> 
> [+Jens in Cc]
> 
> This is stable material, but doesn't deserve CVE status.  There is
> nothing exploitable that is fixed here. Instead, this commit is dropping
> unreachable code after the removal of a feature, following another CVE
> report.  Doing the clean up in the original patch would have made the
> real security fix harder to review.
> 
> The real issue was reported as CVE-2023-52654 and handled by a different
> commit.

FWIW, the same is true for a number of other commits recently. They are
nowhere near CVE material, it's just generic bug fixes.

-- 
Jens Axboe