Bug 2347861 (CVE-2022-49411)

Summary:	CVE-2022-49411 kernel: bfq: Make sure bfqg for which we are queueing requests is online
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, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free vulnerability exists in the Linux kernel. The Bios queued into the BFQ IO scheduler can be associated with a cgroup that was already offline. This issue may then cause the insertion of this bfq_group into a service tree. This bfq_group will get freed as soon as the last associated bio is completed, leading to use-after-free issues for service tree users and denial of service issues.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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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 03:09:18 UTC

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

bfq: Make sure bfqg for which we are queueing requests is online

Bios queued into BFQ IO scheduler can be associated with a cgroup that
was already offlined. This may then cause insertion of this bfq_group
into a service tree. But this bfq_group will get freed as soon as last
bio associated with it is completed leading to use after free issues for
service tree users. Fix the problem by making sure we always operate on
online bfq_group. If the bfq_group associated with the bio is not
online, we pick the first online parent.

Comment 1 Avinash Hanwate 2025-02-26 13:22:59 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022652-CVE-2022-49411-63ad@gregkh/T

Comment 4 Avinash Hanwate 2025-02-26 17:34:16 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022652-CVE-2022-49411-63ad@gregkh/T