Vulnerability Details CVE-2020-11743
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 12.2%
CVSS Severity
CVSS v3 Score 5.5
CVSS v2 Score 2.1
Products affected by CVE-2020-11743
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cpe:2.3:o:fedoraproject:fedora:32
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cpe:2.3:o:xen:xen:4.1.6.1
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