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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jforbes, m.a.young
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2021-08-26 15:35:41 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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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.