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
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 |
||
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 |
References
- https://www.openwall.com/lists/oss-security/2020/06/10/1
- https://www.theregister.com/2020/06/09/linux_kernel_bugs_spectre
- https://ubuntu.com/security/notices/USN-4427-1
- https://ubuntu.com/security/notices/USN-4439-1
- https://ubuntu.com/security/notices/USN-4440-1
- https://ubuntu.com/security/notices/USN-4483-1
- https://ubuntu.com/security/notices/USN-4485-1
- https://www.cve.org/CVERecord?id=CVE-2020-10766
- NVD
- Launchpad
- Debian