Improper Handling of Exceptional Conditions Affecting xen package, versions <4.13.0-r3


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.08% (38th percentile)

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  • Snyk IDSNYK-ALPINE316-XEN-2844867
  • published21 Jul 2020
  • disclosed14 Apr 2020

Introduced: 14 Apr 2020

CVE-2020-11743  (opens in a new tab)
CWE-755  (opens in a new tab)

How to fix?

Upgrade Alpine:3.16 xen to version 4.13.0-r3 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.

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.

CVSS Scores

version 3.1