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CVE-2020-11743 PUBLISHED

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.

EPSS 0.09% · 26.3th percentile

Risk Scores

EPSS Score
0.09%
26.3th percentile

Affected Products

VendorProductVersions
Ubuntu:20.04:LTSxen4.11.3+24-g14b62ab3e5-1ubuntu2.2, 4.11.3+24-g14b62ab3e5-1ubuntu2, 4.11.3+24-g14b62ab3e5-1ubuntu1
Ubuntu:16.04:LTSxen4.6.0-1ubuntu4.2, 4.6.5-0ubuntu1, 4.6.5-0ubuntu1.1
Ubuntu:18.04:LTSxen4.9.2-0ubuntu1, 4.9.0-0ubuntu4, 4.9.0-0ubuntu3

Timeline

References

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