Bug 1997525 (CVE-2021-28700)

Summary:	CVE-2021-28700 xen: malicious dom0less guest could drive Xen out of memory and leads to DoS
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
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
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-08-26 15:35:41 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1997527
Bug Blocks:	1997570

Description Dhananjay Arunesh 2021-08-25 12:50:11 UTC

The dom0less feature allows an administrator to create multiple
unprivileged domains directly from Xen.  Unfortunately, the
memory limit from them is not set. This allow a domain to allocate
memory beyond what an administrator originally configured.

Comment 1 Dhananjay Arunesh 2021-08-25 12:50:49 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1997527]

Comment 2 Product Security DevOps Team 2021-08-26 15:35:41 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.