Bug 1997524 (CVE-2021-28698) - CVE-2021-28698 xen: malicious kernels lead to DoS
Summary: CVE-2021-28698 xen: malicious kernels lead to DoS
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-28698
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1997526
Blocks: 1997570
TreeView+ depends on / blocked
 
Reported: 2021-08-25 12:47 UTC by Dhananjay Arunesh
Modified: 2021-08-26 15:35 UTC (History)
2 users (show)

Fixed In Version:
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Environment:
Last Closed: 2021-08-26 15:35:37 UTC


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Description Dhananjay Arunesh 2021-08-25 12:47:59 UTC
In order to properly monitor resource use, Xen maintains information on
the grant mappings a domain may create to map grants offered by other
domains.  In the process of carrying out certain actions, Xen would
iterate over all such entries, including ones which aren't in use
anymore and some which may have been created but never used.  If the
number of entries for a given domain is large enough, this iterating of
the entire table may tie up a CPU for too long, starving other domains
or causing issues in the hypervisor itself.

Comment 1 Dhananjay Arunesh 2021-08-25 12:50:25 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1997526]

Comment 2 Product Security DevOps Team 2021-08-26 15:35:37 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.


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