Loop with Unreachable Exit Condition ('Infinite Loop') Affecting xen-libs package, versions <4.10.4_26-3.61.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-SLES150-XENLIBS-2665574
  • published14 Apr 2022
  • disclosed3 Sept 2021

Introduced: 3 Sep 2021

CVE-2021-28698  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade SLES:15.0 xen-libs to version 4.10.4_26-3.61.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen-libs package and not the xen-libs package as distributed by SLES. See How to fix? for SLES:15.0 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.

CVSS Scores

version 3.1