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CVE-2020-15563

Published: 7 July 2020

An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.

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 base score: 6.5

Status

Package Release Status
xen
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
eoan Ignored
(reached end-of-life)
focal
Released (4.11.3+24-g14b62ab3e5-1ubuntu2.3)
groovy Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
hirsute Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
impish Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
jammy Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
kinetic Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(code not present)
Binaries built from this source package are in Universe and so are supported by the community.