Integer Underflow Affecting xen package, versions <4.15.2-r0


0.0
medium

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.05% (13th percentile)
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NVD
5.5 medium
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SUSE
4 medium

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  • Snyk ID SNYK-ALPINE315-XEN-2766328
  • published 16 Apr 2022
  • disclosed 25 Jan 2022

How to fix?

Upgrade Alpine:3.15 xen to version 4.15.2-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:3.15 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.