CVE-2021-28688

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up. The lack of cleanup would result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. All Linux versions having the fix for XSA-365 applied are vulnerable. XSA-365 was classified to affect versions back to at least 3.11.

La solución para XSA-365 incluye la inicialización de punteros de modo que el código de limpieza posterior no utilice valores no inicializados o obsoletos. Esta inicialización fue demasiado lejos y, en determinadas condiciones, también puede sobrescribir los punteros que están requiriendo una limpieza. La falta de limpieza resultaría en fugas de subsidios persistentes. A su vez, la filtración impediría a una limpieza completa después de que un invitado respectivo haya terminado, dejando dominios zombies. Todas las versiones de Linux que presentan la corrección para XSA-365 aplicada son vulnerables. XSA-365 se clasificó para afectar a las versiones de al menos 3.11

*Credits: This issue was discovered by Nicolai Stange of SUSE.

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-18 CVE Reserved
2021-04-06 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-665: Improper Initialization

CAPEC

References (3)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html	Mailing List
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://xenbits.xenproject.org/xsa/advisory-371.txt	2022-05-27

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"				>= 3.11 <= 5.10.18 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.11 <= 5.10.18"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected