CVE-2021-4032

Severity Score

4.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability was found in the Linux kernel's KVM subsystem in arch/x86/kvm/lapic.c kvm_free_lapic when a failure allocation was detected. In this flaw the KVM subsystem may crash the kernel due to mishandling of memory errors that happens during VCPU construction, which allows an attacker with special user privilege to cause a denial of service. This flaw affects kernel versions prior to 5.15 rc7.

Se ha encontrado una vulnerabilidad en el subsistema KVM del kernel de Linux en el archivo arch/x86/kvm/lapic.c kvm_free_lapic cuando es detectado una asignación de fallos. En este fallo, el subsistema KVM puede bloquear el kernel debido a un manejo inapropiado de los errores de memoria que se producen durante la construcción de la VCPU, lo que permite a un atacante con privilegios especiales de usuario causar una denegación de servicio. Este fallo afecta a las versiones del kernel anteriores a 5.15 rc7

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-11-29 CVE Reserved
2022-01-21 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2024-12-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-459: Incomplete Cleanup

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7d8a19f9a056a05c5c509fa65af472a322abfee	2024-08-03
https://lkml.org/lkml/2021/9/8/587	2024-08-03

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=2027403	2022-01-28

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"				<= 5.14 Search vendor "Linux" for product "Linux Kernel" and version " <= 5.14"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15 Search vendor "Linux" for product "Linux Kernel" and version "5.15"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15 Search vendor "Linux" for product "Linux Kernel" and version "5.15"		rc1		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15 Search vendor "Linux" for product "Linux Kernel" and version "5.15"		rc2		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15 Search vendor "Linux" for product "Linux Kernel" and version "5.15"		rc3		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15 Search vendor "Linux" for product "Linux Kernel" and version "5.15"		rc4		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15 Search vendor "Linux" for product "Linux Kernel" and version "5.15"		rc5		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15 Search vendor "Linux" for product "Linux Kernel" and version "5.15"		rc6		Affected