CVE-2023-31346

kernel: Reserved fields in guest message responses may not be zero initialized

Severity Score

6.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

Failure to initialize
memory in SEV Firmware may allow a privileged attacker to access stale data
from other guests.

No inicializar la memoria en el firmware SEV puede permitir que un atacante privilegiado acceda a datos obsoletos de otros invitados.

A flaw was found in some AMD CPUs where the guest message responses have not been zero-initialized. This issue may allow a local attacker with the ability to run arbitrary code on a container or virtual machine to discover sensitive information contained in the host system's memory.

Failure to initialize memory in SEV Firmware may allow a privileged attacker to access stale data from other guests.

An update for linux-firmware is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update Service, and Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

Multiple

Confidentiality

Complete

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-04-27 CVE Reserved
2024-02-13 CVE Published
2024-02-15 First Exploit
2025-03-20 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-284: Improper Access Control

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC
https://github.com/Freax13/cve-2023-31346-poc	2024-02-15

URL	Date	SRC

URL	Date	SRC
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3007	2024-02-14
https://access.redhat.com/security/cve/CVE-2023-31346	2024-08-27
https://bugzilla.redhat.com/show_bug.cgi?id=2250458	2024-08-27

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
AMD Search vendor "AMD"		3rd Gen AMD EPYC™ Processors Search vendor "AMD" for product "3rd Gen AMD EPYC™ Processors"				<= Search vendor "AMD" for product "3rd Gen AMD EPYC™ Processors" and version " <= "		en		Affected
AMD Search vendor " AMD"		4th Gen AMD EPYC™ Processors Search vendor " AMD" for product "4th Gen AMD EPYC™ Processors"				<= Search vendor " AMD" for product "4th Gen AMD EPYC™ Processors" and version " <= "		en		Affected