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CVE-2020-10766

Public on 2020-07-14
Modified on 2020-07-21
Description

A logic bug flaw was found in the Linux kernel's 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.

Severity
Important
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CVSS v3 Base Score
5.5
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2020-07-14 21:14 ALAS-2020-1401
Amazon Linux 2 - Core kernel 2020-07-21 16:34 ALAS2-2020-1465
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-01-20 19:22 ALAS2KERNEL-5.4-2022-013
Amazon Linux 2 - Livepatch Extra kernel-livepatch-4.14.181-142.260 2020-09-04 17:55 ALAS2LIVEPATCH-2020-025

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD CVSSv2 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N