CVE-2020-10766: linux kernel kernel Expected Behavior Violation

Modified

AliasesUBUNTU-CVE-2020-10766DEBIAN-CVE-2020-10766

Published 15-09-2020Last modified 04-08-2024

Vulnerability summary

CVE-2020-10766 is a medium (CVSS 5.5) Expected Behavior Violation vulnerability in linux kernel kernel. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 40.1% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

5.5/10

010

Medium · v3.1 (CVE.org)

EPSS score

0.46%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

15-09-2020
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 4 sources · 2 versions

v3.15.5v2.02.1

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.47% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

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

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu46 products

linux< 4.4.0-186.216 | < 4.15.0-115.116 | < 5.4.0-45.49
linux-aws< 4.4.0-1075.79 | < 4.4.0-1111.123 | < 4.15.0-1080.84 | < 5.4.0-1022.22
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.3< 5.3.0-1032.34~18.04.2
linux-aws-5.4< 5.4.0-1022.22~18.04.1