From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E0BC93B9600 for ; Mon, 4 May 2026 12:10:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777896620; cv=none; b=l4fjop82W+KEhB7T0oMwDnvq4IqA9EcjXpqF7vFUYyziuyMZC3ojvRYRkYbU3QvLFZYmeWI+po6ba3p7Pg1ZsutsvuzJhmdr+BCziTh8EZAlZVwK/4MgLlUn0A+93A/Zc6JA5Wuu1xg/qGthoab6qOcONmc/CtVnMve4RSxjpvk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777896620; c=relaxed/simple; bh=0Wm6CLOEwddQc/Sf73RpwZP5AUTVDaSUAbK5avJdtZU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=RWOw36++Vm5zifRZHnkox7EjKwwhUS8FFUxWpFfWEo6RfxqsN33Z9ZoWWQ1SSySVl9N+lAqGkb3PzFLoVrwS3AmZbp97+7v0mcO5ia1s43EZdiNLqiCM9KszikeHKlVOZG3QUcjGfFSzx3XHesHYfUszVCFVYtcgtmHkkZOwZQw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=G7Bvhdu/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="G7Bvhdu/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66AB3C2BCB8; Mon, 4 May 2026 12:10:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777896619; bh=0Wm6CLOEwddQc/Sf73RpwZP5AUTVDaSUAbK5avJdtZU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=G7Bvhdu/Dc/1osIuva33mELVFQ8pNenlTxQ9mrrXAkT6H4pNteGiBT4FX/B0RJGfG eMZ+MtO02UHgJ8YFVMGlRqub8NsYqVFzmlr28tEKyaPCsD8RI8Sm5BepwLCXd+2TnO tyPSeYXc6oWVAl+TbIK3baf3S/bshqrML2ypTSQs= Date: Mon, 4 May 2026 14:10:17 +0200 From: Greg KH To: Carlo Conti Cc: axboe@kernel.dk, io-uring@vger.kernel.org Subject: Re: [SECURITY] io_uring UAF: io_uring_cmd_issue_blocking missing sqe copy before RESIZE_RINGS Message-ID: <2026050401-juniper-undocked-190c@gregkh> References: Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, May 04, 2026 at 01:59:01PM +0200, Carlo Conti wrote: > Hello, > > I have identified a Use-After-Free vulnerability in the Linux kernel > io_uring subsystem, confirmed on Linux 6.19.11. That is an unsupported and obsolete kernel version, does this happen on the latest 7.0 release? And can you provide a patch to fix this issue as you seem to be able to test this? Also, you sent this to a public mailing list, so I'll take security@k.o off the response now as it's not needed. thanks, greg k-h