linux-cve-announce - CVE-2022-49140: Revert "nbd: fix possible overflow on 'first_minor' in nbd_dev

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Message-ID: <2025022607-CVE-2022-49140-974f@gregkh>
Date: Wed, 26 Feb 2025 02:55:45 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49140: Revert "nbd: fix possible overflow on 'first_minor' in nbd_dev_add()"

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

Revert "nbd: fix possible overflow on 'first_minor' in nbd_dev_add()"

This reverts commit 6d35d04a9e18990040e87d2bbf72689252669d54.

Both Gabriel and Borislav report that this commit casues a regression
with nbd:

sysfs: cannot create duplicate filename '/dev/block/43:0'

Revert it before 5.18-rc1 and we'll investigage this separately in
due time.

The Linux kernel CVE team has assigned CVE-2022-49140 to this issue.


Affected and fixed versions
===========================

	Fixed in 5.15.34 with commit 3b14aa053181709d42319d4145855025c23ddd12
	Fixed in 5.16.19 with commit 24781c1b691c60c42748c669973d567a90573337
	Fixed in 5.17.2 with commit 9d73b40f979737029bac724c39648016da3f914c
	Fixed in 5.18 with commit 7198bfc2017644c6b92d2ecef9b8b8e0363bb5fd

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-2022-49140
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/block/nbd.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/3b14aa053181709d42319d4145855025c23ddd12
	https://git.kernel.org/stable/c/24781c1b691c60c42748c669973d567a90573337
	https://git.kernel.org/stable/c/9d73b40f979737029bac724c39648016da3f914c
	https://git.kernel.org/stable/c/7198bfc2017644c6b92d2ecef9b8b8e0363bb5fd