Bug 2347893 (CVE-2022-49143)

Summary:	CVE-2022-49143 kernel: nbd: fix possible overflow on 'first_minor' in nbd_dev_add()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, rhel-process-autobot, vkumar, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel's Network Block Device (NBD) subsystem. The issue involved a potential integer overflow in the nbd_dev_add() function, where large values of the index parameter could lead to incorrect calculations of the first_minor value. This miscalculation may result in the creation of duplicate device entries in the sysfs filesystem, causing system instability or other unintended behaviors.	Story Points:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-02-26 03:10:25 UTC

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

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

When 'index' is a big numbers, it may become negative which forced
to 'int'. then 'index << part_shift' might overflow to a positive
value that is not greater than '0xfffff', then sysfs might complains
about duplicate creation. Because of this, move the 'index' judgment
to the front will fix it and be better.

Comment 1 Avinash Hanwate 2025-02-26 19:57:55 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022607-CVE-2022-49143-d2d8@gregkh/T