Bug 2135262 (CVE-2022-33748)

Summary:	CVE-2022-33748 xen: lock order inversion in transitive grant copy handling
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jforbes, m.a.young
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
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Last Closed:	2022-11-29 20:58:02 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2135263
Bug Blocks:

Description Marian Rehak 2022-10-17 07:17:34 UTC

Lock order inversion in transitive grant copy handling As part of XSA-226 a missing cleanup call was inserted on an error handling path. While doing so, locking requirements were not paid attention to. As a result two cooperating guests granting each other transitive grants can cause locks to be acquired nested within one another, but in respectively opposite order. With suitable timing between the involved grant copy operations this may result in the locking up of a CPU.

Reference:

https://xenbits.xenproject.org/xsa/advisory-411.txt
http://xenbits.xen.org/xsa/advisory-411.html

Comment 1 Marian Rehak 2022-10-17 07:17:48 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 2135263]

Comment 2 Product Security DevOps Team 2022-11-29 20:58:01 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.