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CVE-2020-10766

Published: 10 June 2020

A logic bug flaw was found in Linux kernel before 5.8-rc1 in the implementation of SSBD. A bug in the logic handling allows an attacker with a local account to disable SSBD protection during a context switch when additional speculative execution mitigations are in place. This issue was introduced when the per task/process conditional STIPB switching was added on top of the existing SSBD switching. The highest threat from this vulnerability is to confidentiality.

From the Ubuntu Security Team

It was discovered that the Linux kernel did not correctly apply Speculative Store Bypass Disable (SSBD) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-115.116)
eoan Ignored
(end of life, was pending)
focal
Released (5.4.0-45.49)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc1)
xenial
Released (4.4.0-186.216)
Patches:
Introduced by

5bfbe3ad5840d941b89bcac54b821ba14f50a0ba

Fixed by dbbe2ad02e9df26e372f38cc3e70dab9222c832e
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1080.84)
eoan Ignored
(end of life, was pending)
focal
Released (5.4.0-1022.22)
trusty
Released (4.4.0-1075.79)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1111.123)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34~18.04.2)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1080.84~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Ignored
(end of life, was pending)
focal
Released (5.4.0-1023.23)
trusty
Released (4.15.0-1093.103~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1093.103~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1093.103)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1034.35~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1023.23~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Ignored
(end of life, was pending)
focal
Released (5.4.0-1022.22)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1081.92~16.04.1)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1081.92)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1067.70)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1045.46)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-64.58~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-115.116~16.04.1)
linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-45.49~18.04.2)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1072.73)
eoan Ignored
(end of life, was pending)
focal
Released (5.4.0-1021.21)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1077.84)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

trusty
Released (4.4.0-186.216~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.8~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1094.104)
eoan Ignored
(end of life)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal
Released (5.6.0-1020.20)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1065.70)
eoan Ignored
(end of life)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1051.55)
eoan Ignored
(end of life, was pending)
focal
Released (5.4.0-1022.22)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1051.55~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1030.32~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-1016.17)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1016.17~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1068.72)
eoan Ignored
(end of life, was pending)
focal Ignored
(end of life, was needs-triage)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1136.145)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1030.32~18.04.2)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-31.35)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1084.92)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1140.148)

Severity score breakdown

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