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CVE-2020-15564

Published: 7 July 2020

An issue was discovered in Xen through 4.13.x, allowing Arm guest OS users to cause a hypervisor crash because of a missing alignment check in VCPUOP_register_vcpu_info. The hypercall VCPUOP_register_vcpu_info is used by a guest to register a shared region with the hypervisor. The region will be mapped into Xen address space so it can be directly accessed. On Arm, the region is accessed with instructions that require a specific alignment. Unfortunately, there is no check that the address provided by the guest will be correctly aligned. As a result, a malicious guest could cause a hypervisor crash by passing a misaligned address. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). All Xen versions are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected.

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 Needed

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 Needed

Binaries built from this source package are in Universe and so are supported by the community.