CVE-2020-4788

kernel: speculation on incompletely validated data on IBM Power9

Severity Score

4.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances. IBM X-Force ID: 189296.

Los procesadores IBM Power9 (AIX versiones 7.1, 7.2 y VIOS versión 3.1), podrían permitir a un usuario local obtener información confidencial de los datos en la caché L1 en circunstancias atenuantes. IBM X-Force ID: 189296

A flaw was found in the Linux kernel. IBM Power9 processors can speculatively operate on data stored in the L1 cache before it has been completely validated. The attack has limited access to memory and is only able to access memory normally permissible to the execution context. The highest threat from this vulnerability is to data confidentiality.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-12-30 CVE Reserved
2020-11-20 CVE Published
2023-03-08 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CAPEC

References (9)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2020/11/23/1	Mailing List

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2020/11/20/3	2023-11-07
https://www.ibm.com/support/pages/node/6370729	2023-11-07
https://www.oracle.com/security-alerts/cpujul2022.html	2023-11-07

URL	Date	SRC
https://exchange.xforce.ibmcloud.com/vulnerabilities/189296	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-4788	2022-05-10
https://bugzilla.redhat.com/show_bug.cgi?id=1888433	2022-05-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ibm Search vendor "Ibm"	Vios Search vendor "Ibm" for product "Vios"	3.1.0 Search vendor "Ibm" for product "Vios" and version "3.1.0"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Vios Search vendor "Ibm" for product "Vios"	3.1.1 Search vendor "Ibm" for product "Vios" and version "3.1.1"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Vios Search vendor "Ibm" for product "Vios"	3.1.2 Search vendor "Ibm" for product "Vios" and version "3.1.2"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Aix Search vendor "Ibm" for product "Aix"	7.1.0 Search vendor "Ibm" for product "Aix" and version "7.1.0"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Aix Search vendor "Ibm" for product "Aix"	7.1.5 Search vendor "Ibm" for product "Aix" and version "7.1.5"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Aix Search vendor "Ibm" for product "Aix"	7.2.0 Search vendor "Ibm" for product "Aix" and version "7.2.0"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Aix Search vendor "Ibm" for product "Aix"	7.2.3 Search vendor "Ibm" for product "Aix" and version "7.2.3"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Aix Search vendor "Ibm" for product "Aix"	7.2.4 Search vendor "Ibm" for product "Aix" and version "7.2.4"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Ibm Search vendor "Ibm"	Aix Search vendor "Ibm" for product "Aix"	7.2.5 Search vendor "Ibm" for product "Aix" and version "7.2.5"	-	Affected	in	Ibm Search vendor "Ibm"	Power9 Search vendor "Ibm" for product "Power9"	-	-	Safe
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Binding Support Function Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function"				22.1.3 Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" and version "22.1.3"		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Network Exposure Function Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function"				22.1.1 Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" and version "22.1.1"		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Policy Search vendor "Oracle" for product "Communications Cloud Native Core Policy"				22.2.0 Search vendor "Oracle" for product "Communications Cloud Native Core Policy" and version "22.2.0"		-		Affected