<p>Upgrade <code>Alpine:3.20</code> <code>xen</code> to version 4.15.0-r2 or higher.</p>

Loop with Unreachable Exit Condition ('Infinite Loop') Affecting xen package, versions <4.15.0-r2

Threat Intelligence

0.05% (16^th percentile)

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Snyk ID SNYK-ALPINE320-XEN-7012626
published 23 May 2024
disclosed 27 Aug 2021

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Introduced: 27 Aug 2021

CVE-2021-28698 Open this link in a new tab CWE-835 Open this link in a new tab

How to fix?

Upgrade Alpine:3.20 xen to version 4.15.0-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Alpine. See How to fix? for Alpine:3.20 relevant fixed versions and status.

long running loops in grant table handling 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. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of "cooperating" guests may, however, cause the effects to be more severe.

References

CVSS Scores

version 3.1

Attack Vector (AV)

Local
Attack Complexity (AC)

Low
Privileges Required (PR)

Low
User Interaction (UI)

None

Scope (S)

Unchanged

Confidentiality (C)

None
Integrity (I)

None
Availability (A)

High