Linux Kernel up to 5.7 Enhanced IBPB expected behavior violation

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.7. It has been classified as critical. Impacted is an unknown function of the component Enhanced IBPB. The manipulation leads to expected behavior violation. This vulnerability is listed as CVE-2020-10767. The attack must be carried out locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.7 (Operating System). It has been rated as critical. This issue affects an unknown code block of the component Enhanced IBPB. The manipulation with an unknown input leads to a expected behavior violation vulnerability. Using CWE to declare the problem leads to CWE-440. A feature, API, or function does not perform according to its specification. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the Linux kernel before 5.8-rc1 in the implementation of the Enhanced IBPB (Indirect Branch Prediction Barrier). The IBPB mitigation will be disabled when STIBP is not available or when the Enhanced Indirect Branch Restricted Speculation (IBRS) is available. This flaw allows a local attacker to perform a Spectre V2 style attack when this configuration is active. The highest threat from this vulnerability is to confidentiality.

The weakness was presented 09/15/2020 as not defined bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. The identification of this vulnerability is CVE-2020-10767 since 03/20/2020. Attacking locally is a requirement. The requirement for exploitation is a simple authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.8-rc1 eliminates this vulnerability.

See VDB-161242 for similar entry. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Expected behavior violation
CWE: CWE-440 / CWE-436
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.8-rc1

Timelineinfo

03/20/2020 🔍
09/15/2020 +179 days 🔍
09/16/2020 +1 days 🔍
09/16/2020 +0 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: bugzilla.redhat.com
Status: Not defined

CVE: CVE-2020-10767 (🔍)
GCVE (CVE): GCVE-0-2020-10767
GCVE (VulDB): GCVE-100-161243
See also: 🔍

Entryinfo

Created: 09/16/2020 07:24
Updated: 09/16/2020 07:29
Changes: 09/16/2020 07:24 (42), 09/16/2020 07:29 (12)
Complete: 🔍
Cache ID: 216::103

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