CVE-2021-3735

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 deadlock issue was found in the AHCI controller device of QEMU. It occurs on a software reset (ahci_reset_port) while handling a host-to-device Register FIS (Frame Information Structure) packet from the guest. A privileged user inside the guest could use this flaw to hang the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.

Se ha encontrado un problema de bloqueo en el dispositivo controlador AHCI de QEMU. Es producido en un reinicio de software (ahci_reset_port) mientras es manejado un paquete FIS (Frame Information Structure) de registro de host a dispositivo desde el huésped. Un usuario privilegiado dentro del huésped podría usar este fallo para colgar el proceso de QEMU en el host, resultando en una condición de denegación de servicio. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema.

*Credits: N/A

CVSS Scores

NISTv3.1 4.4

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-25 CVE Reserved
2022-08-26 CVE Published
2024-03-18 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-667: Improper Locking

CAPEC

References (3)

URL	Tag	Source
https://access.redhat.com/security/cve/CVE-2021-3735	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1997184	Issue Tracking
https://security-tracker.debian.org/tracker/CVE-2021-3735	Third Party Advisory

URL	Date	SRC

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
Qemu Search vendor "Qemu"		Qemu Search vendor "Qemu" for product "Qemu"				6.1.0 Search vendor "Qemu" for product "Qemu" and version "6.1.0"		rc4		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected