CVE-2020-25221

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

get_gate_page in mm/gup.c in the Linux kernel 5.7.x and 5.8.x before 5.8.7 allows privilege escalation because of incorrect reference counting (caused by gate page mishandling) of the struct page that backs the vsyscall page. The result is a refcount underflow. This can be triggered by any 64-bit process that can use ptrace() or process_vm_readv(), aka CID-9fa2dd946743.

La función get_gate_page en el archivo mm/gup.c en el kernel de Linux versiones 5.7.x y versiones 5.8.x anteriores a 5.8.7, permite una escalada de privilegios debido al conteo de referencias incorrecto (causado por el manejo inapropiado de una página de puerta) de la página de estructura que respalda la página vsyscall. El resultado es un subdesbordamiento del conteo. Esto puede ser desencadenado por cualquier proceso de 64 bits que pueda usar las funciones ptrace() o process_vm_readv(), también se conoce como CID-9fa2dd946743

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-09-10 CVE Reserved
2020-09-10 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-672: Operation on a Resource after Expiration or Release

CAPEC

References (6)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2020/09/10/4	Mailing List
https://security.netapp.com/advisory/ntap-20201001-0003	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a	2023-02-02
https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2	2023-02-02
https://www.openwall.com/lists/oss-security/2020/09/08/4	2023-02-02

URL	Date	SRC
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7	2023-02-02

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"				>= 5.7.0 < 5.8.7 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.7.0 < 5.8.7"		-		Affected
Netapp Search vendor "Netapp"		Cloud Backup Search vendor "Netapp" for product "Cloud Backup"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire\, Enterprise Sds \& Hci Storage Node Search vendor "Netapp" for product "Solidfire\, Enterprise Sds \& Hci Storage Node"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire \& Hci Management Node Search vendor "Netapp" for product "Solidfire \& Hci Management Node"				-		-		Affected
Netapp Search vendor "Netapp"		Hci Compute Node Search vendor "Netapp" for product "Hci Compute Node"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire Baseboard Management Controller Search vendor "Netapp" for product "Solidfire Baseboard Management Controller"				-		-		Affected