CVE-2019-20794

Severity Score

4.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed. A user can create their own PID namespace, and mount a FUSE filesystem. Upon interaction with this FUSE filesystem, if the userspace component is terminated via a kill of the PID namespace's pid 1, it will result in a hung task, and resources being permanently locked up until system reboot. This can result in resource exhaustion.

Se detectó un problema en el kernel de Linux versiones 4.18 hasta 5.6.11, cuando los espacios de nombre de un usuario no privilegiado están permitidos. Un usuario puede crear su propio espacio de nombre PID, y montar un sistema de archivos FUSE. Tras interactuar con este sistema de archivos FUSE, si el componente namespace es finalizado por medio de la eliminación del pid 1 del espacio de nombre PID, resultará en una suspensión de tarea, y los recursos se bloquearán permanentemente hasta que se reinicie el sistema. Esto puede resultar en un agotamiento de los recursos.

*Credits: N/A

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-05-09 CVE Reserved
2020-05-09 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-772: Missing Release of Resource after Effective Lifetime

CAPEC

References (4)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2020/08/24/1	Mailing List
https://security.netapp.com/advisory/ntap-20200608-0001	Third Party Advisory

URL	Date	SRC
https://github.com/sargun/fuse-example	2024-08-05
https://sourceforge.net/p/fuse/mailman/message/36598753	2024-08-05

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.18 <= 5.6.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.18 <= 5.6.11"		-		Affected