CVE-2020-10766

EUVD-2020-3181

15.09.2020, 23:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	5.5 MEDIUM	LOCAL	LOW	LOW	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
redhat	CNA	5.5 MEDIUM	LOCAL	LOW	LOW	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 23%

Affected Products (NVD)

Vendor	Product	Version
linux	linux_kernel	𝑥 < 5.8.0

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

linux

bookworm	6.1.106-3 fixed
bookworm (security)	6.1.112-1 fixed
bullseye	5.10.223-1 fixed
bullseye (security)	5.10.226-1 fixed
sid	6.11.6-1 fixed
trixie	6.11.5-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

linux

bionic	Fixed 4.15.0-115.116 released
eoan	ignored
focal	Fixed 5.4.0-45.49 released
trusty	ignored
xenial	Fixed 4.4.0-186.216 released

linux-aws

bionic	Fixed 4.15.0-1080.84 released
eoan	ignored
focal	Fixed 5.4.0-1022.22 released
trusty	Fixed 4.4.0-1075.79 released
xenial	Fixed 4.4.0-1111.123 released

linux-aws-5.0

bionic	ignored
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-aws-5.3

bionic	Fixed 5.3.0-1032.34~18.04.2 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-aws-5.4

bionic	Fixed 5.4.0-1022.22~18.04.1 released
focal	dne
trusty	dne
xenial	dne

linux-aws-hwe

bionic	dne
eoan	dne
focal	dne
trusty	dne
xenial	Fixed 4.15.0-1080.84~16.04.1 released

linux-azure

bionic	ignored
eoan	ignored
focal	Fixed 5.4.0-1023.23 released
trusty	Fixed 4.15.0-1093.103~14.04.1 released
xenial	Fixed 4.15.0-1093.103~16.04.1 released

linux-azure-4.15

bionic	Fixed 4.15.0-1093.103 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-azure-5.3

bionic	Fixed 5.3.0-1034.35~18.04.1 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-azure-5.4

bionic	Fixed 5.4.0-1023.23~18.04.1 released
focal	dne
trusty	dne
xenial	dne

linux-azure-edge

bionic	ignored
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-gcp

bionic	ignored
eoan	ignored
focal	Fixed 5.4.0-1022.22 released
trusty	dne
xenial	Fixed 4.15.0-1081.92~16.04.1 released

linux-gcp-4.15

bionic	Fixed 4.15.0-1081.92 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-gcp-5.3

bionic	Fixed 5.3.0-1032.34~18.04.1 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-gcp-5.4

bionic	Fixed 5.4.0-1022.22~18.04.1 released
focal	dne
trusty	dne
xenial	dne

linux-gcp-edge

bionic	ignored
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-gke-4.15

bionic	Fixed 4.15.0-1067.70 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-gke-5.0

bionic	Fixed 5.0.0-1045.46 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-gke-5.3

bionic	Fixed 5.3.0-1032.34~18.04.1 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-hwe

bionic	Fixed 5.3.0-64.58~18.04.1 released
eoan	dne
focal	dne
trusty	dne
xenial	Fixed 4.15.0-115.116~16.04.1 released

linux-hwe-5.4

bionic	Fixed 5.4.0-45.49~18.04.2 released
focal	dne
trusty	dne
xenial	dne

linux-hwe-edge

bionic	ignored
eoan	dne
focal	dne
trusty	dne
xenial	ignored

linux-kvm

bionic	Fixed 4.15.0-1072.73 released
eoan	ignored
focal	Fixed 5.4.0-1021.21 released
trusty	dne
xenial	Fixed 4.4.0-1077.84 released

linux-lts-trusty

bionic	dne
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-lts-xenial

bionic	dne
eoan	dne
focal	dne
trusty	Fixed 4.4.0-186.216~14.04.1 released
xenial	dne

linux-oem

bionic	Fixed 4.15.0-1094.104 released
eoan	ignored
focal	dne
trusty	dne
xenial	ignored

linux-oem-5.6

bionic	dne
eoan	dne
focal	Fixed 5.6.0-1020.20 released
trusty	dne
xenial	dne

linux-oem-osp1

bionic	Fixed 5.0.0-1065.70 released
eoan	ignored
focal	dne
trusty	dne
xenial	dne

linux-oracle

bionic	Fixed 4.15.0-1051.55 released
eoan	ignored
focal	Fixed 5.4.0-1022.22 released
trusty	dne
xenial	Fixed 4.15.0-1051.55~16.04.1 released

linux-oracle-5.0

bionic	ignored
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-oracle-5.3

bionic	Fixed 5.3.0-1030.32~18.04.1 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-oracle-5.4

bionic	Fixed 5.4.0-1022.22~18.04.1 released
focal	dne
trusty	dne
xenial	dne

linux-raspi

bionic	dne
eoan	dne
focal	Fixed 5.4.0-1016.17 released
trusty	dne
xenial	dne

linux-raspi-5.4

bionic	Fixed 5.4.0-1016.17~18.04.1 released
focal	dne
trusty	dne
xenial	dne

linux-raspi2

bionic	Fixed 4.15.0-1068.72 released
eoan	ignored
focal	ignored
trusty	dne
xenial	Fixed 4.4.0-1136.145 released

linux-raspi2-5.3

bionic	Fixed 5.3.0-1030.32~18.04.2 released
eoan	dne
focal	dne
trusty	dne
xenial	dne

linux-riscv

bionic	dne
eoan	dne
focal	Fixed 5.4.0-31.35 released
trusty	dne
xenial	dne

linux-snapdragon

bionic	Fixed 4.15.0-1084.92 released
eoan	dne
focal	dne
trusty	dne
xenial	Fixed 4.4.0-1140.148 released

Common Weakness Enumeration

CWE-440 - Expected Behavior Violation
A feature, API, or function does not perform according to its specification.

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10766

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dbbe2ad02e9df26e372f38cc3e70dab9222c832e

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10766

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dbbe2ad02e9df26e372f38cc3e70dab9222c832e