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CVE-2020-11743

Published: 14 April 2020

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.

Notes

AuthorNote
mdeslaur
hypervisor packages are in universe. For
issues in the hypervisor, add appropriate
tags to each section, ex:
Tags_xen: universe-binary

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
xen
Launchpad, Ubuntu, Debian
bionic Needs triage

hirsute Ignored
(end of life)
groovy Ignored
(end of life)
xenial Needs triage

jammy Not vulnerable
(4.11.4-1)
kinetic Not vulnerable
(4.11.4-1)
lunar Not vulnerable
(4.11.4-1)
eoan Ignored
(end of life)
focal
Released (4.11.3+24-g14b62ab3e5-1ubuntu2.3)
impish Ignored
(end of life)
trusty Does not exist

upstream Needs triage

mantic Not vulnerable
(4.11.4-1)
Binaries built from this source package are in Universe and so are supported by the community.

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H