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CVE-2020-15565

Published: 7 July 2020

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both TLBs. Furthermore, IOMMUs may be non-coherent, and hence prior to flushing IOMMU TLBs, a CPU cache also needs writing back to memory after changes were made. Such writing back of cached data was missing in particular when splitting large page mappings into smaller granularity ones. A malicious guest may be able to retain read/write DMA access to frames returned to Xen's free pool, and later reused for another purpose. Host crashes (leading to a Denial of Service) and privilege escalation cannot be ruled out. Xen versions from at least 3.2 onwards are affected. Only x86 Intel systems are affected. x86 AMD as well as Arm systems are not affected. Only x86 HVM guests using hardware assisted paging (HAP), having a passed through PCI device assigned, and having page table sharing enabled can leverage the vulnerability. Note that page table sharing will be enabled (by default) only if Xen considers IOMMU and CPU large page size support compatible.

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

8.8

Score breakdown

Status

Package Release Status
xen
Launchpad, Ubuntu, Debian
bionic Needed

eoan Ignored
(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)
lunar Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
mantic Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
noble Not vulnerable
(4.11.4+24-gddaaccbbab-1ubuntu2)
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.

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H