linux-kernel - Re: CVE-2022-50031: scsi: iscsi: Fix HW conn removal use after free

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Message-ID: <563d1da8-abd8-48e6-9aab-5a4f13859995@huawei.com>
Date: Thu, 3 Jul 2025 22:16:58 +0800
From: Li Lingfeng <lilingfeng3@...wei.com>
To: Greg Kroah-Hartman <gregkh@...nel.org>
CC: <cve@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-cve-announce@...r.kernel.org>, <lduncan@...e.com>,
	<cleech@...hat.com>, Mike Christie <michael.christie@...cle.com>,
	<James.Bottomley@...senPartnership.com>, <martin.petersen@...cle.com>,
	<open-iscsi@...glegroups.com>, <linux-scsi@...r.kernel.org>, yangerkun
	<yangerkun@...wei.com>, "zhangyi (F)" <yi.zhang@...wei.com>, Hou Tao
	<houtao1@...wei.com>, "yukuai (C)" <yukuai3@...wei.com>,
	"chengzhihao1@...wei.com" <chengzhihao1@...wei.com>
Subject: Re: CVE-2022-50031: scsi: iscsi: Fix HW conn removal use after free

Hi, Greg

在 2025/6/18 19:01, Greg Kroah-Hartman 写道:
> From: Greg Kroah-Hartman <gregkh@...nel.org>
>
> Description
> ===========
>
> In the Linux kernel, the following vulnerability has been resolved:
>
> scsi: iscsi: Fix HW conn removal use after free
>
> If qla4xxx doesn't remove the connection before the session, the iSCSI
> class tries to remove the connection for it. We were doing a
> iscsi_put_conn() in the iter function which is not needed and will result
> in a use after free because iscsi_remove_conn() will free the connection.
>
> The Linux kernel CVE team has assigned CVE-2022-50031 to this issue.
>
>
> Affected and fixed versions
> ===========================
>
> 	Fixed in 5.19.4 with commit 0483ffc02ebb953124c592485a5c48ac4ffae5fe
> 	Fixed in 6.0 with commit c577ab7ba5f3bf9062db8a58b6e89d4fe370447e
>
> Please see https://www.kernel.org for a full list of currently supported
> kernel versions by the kernel community.
>
> Unaffected versions might change over time as fixes are backported to
> older supported kernel versions.  The official CVE entry at
> 	https://cve.org/CVERecord/?id=CVE-2022-50031
> will be updated if fixes are backported, please check that for the most
> up to date information about this issue.
>
>
> Affected files
> ==============
>
> The file(s) affected by this issue are:
> 	drivers/scsi/scsi_transport_iscsi.c
>
>
> Mitigation
> ==========
>
> The Linux kernel CVE team recommends that you update to the latest
> stable kernel version for this, and many other bugfixes.  Individual
> changes are never tested alone, but rather are part of a larger kernel
> release.  Cherry-picking individual commits is not recommended or
> supported by the Linux kernel community at all.  If however, updating to
> the latest release is impossible, the individual changes to resolve this
> issue can be found at these commits:
> 	https://git.kernel.org/stable/c/0483ffc02ebb953124c592485a5c48ac4ffae5fe
> 	https://git.kernel.org/stable/c/c577ab7ba5f3bf9062db8a58b6e89d4fe370447e
>
Based on the details described in the linked discussion, I have concerns
that this patch may not fully resolve the Use-After-Free vulnerability.
Instead, it appears the changes could potentially introduce memory leak
issues.
Given these concerns, I'd recommend rejecting this CVE until we can
thoroughly investigate and validate the complete solution.

Link: 
https://lore.kernel.org/all/0b0a0bcf-b805-5041-9923-37ad391169c0@huaweicloud.com/

Thanks,
Lingfeng