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CVE-2020-15852

Published: 20 July 2020

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

From the Ubuntu Security Team

Andy Lutomirski discovered that the Linux kernel did not properly handle I/O port permissions for paravirtualized (PV) guests on x86 platforms in some situations. An attacker in a paravirtualized guest could possibly use this to gain access to restricted I/O devices.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux-hwe-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

trusty Does not exist

focal Not vulnerable
(5.8.0-23.24~20.04.1)
groovy Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.8~rc6)
groovy Does not exist

trusty Does not exist

xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.13.0-16.19)
focal Not vulnerable
(5.4.0-9.12)
groovy Not vulnerable
(5.4.0-26.30)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.2.0-16.19)
Patches:
Introduced by

22fe5b0439dd53643fd6f4c582c46c6dba0fde53

Fixed by cadfad870154e14f745ec845708bc17d166065f2
linux-aws-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

bionic Not vulnerable
(5.4.0-1018.18~18.04.1)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-aws
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.4.0-1001.10)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1016.17~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Not vulnerable
(5.4.0-1006.6)
groovy Not vulnerable
(5.4.0-1010.10)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.11.0-1009.9)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1082.92)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1007.8~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1020.20~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.10.0-1004.4)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1071.81)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.2)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1030.32)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1001.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.8.0-36.36~16.04.1)
linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-37.41~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
focal Not vulnerable
(5.4.0-1004.4)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.4.0-1004.9)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc6)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.6.0-1023.23)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1010.11)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-raspi
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable
(5.4.0-1007.7)
groovy Not vulnerable
(5.4.0-1008.8)
trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1013.13~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.13.0-1005.5)
focal Ignored
(end of life, was needs-triage)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.2.0-1013.19)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1017.19~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-riscv
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable
(5.4.0-24.28)
groovy Not vulnerable
(5.4.0-24.28)
trusty Does not exist

upstream
Released (5.8~rc6)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.4.0-1077.82)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc6)
xenial Not vulnerable
(4.4.0-1013.15)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H