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Loop with Unreachable Exit Condition ('Infinite Loop') Affecting xen package, versions <4.13.0-r0

0.0
medium

Snyk CVSS

    Attack Complexity Low
    Scope Changed
    Availability High

    Threat Intelligence

    EPSS 0.05% (14th percentile)
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NVD
6.5 medium
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SUSE
6.5 medium

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  • Snyk ID SNYK-ALPINE315-XEN-1928565
  • published 21 Jul 2020
  • disclosed 11 Dec 2019
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Introduced: 11 Dec 2019

CVE-2019-19582 Open this link in a new tab
CWE-835 Open this link in a new tab

How to fix?

Upgrade Alpine:3.15 xen to version 4.13.0-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.

An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable.