Integer Underflow Affecting xen package, versions <4.16.1-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-ALPINE316-XEN-2845269
  • published16 Apr 2022
  • disclosed25 Jan 2022

Introduced: 25 Jan 2022

CVE-2022-23034  (opens in a new tab)
CWE-191  (opens in a new tab)

How to fix?

Upgrade Alpine:3.16 xen to version 4.16.1-r0 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:3.16 relevant fixed versions and status.

A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled. PV guests can request two forms of mappings. When both are in use for any individual mapping, unmapping of such a mapping can be requested in two steps. The reference count for such a mapping would then mistakenly be decremented twice. Underflow of the counters gets detected, resulting in the triggering of a hypervisor bug check.

CVSS Scores

version 3.1