CVE-2021-26318

Side-channels Related to the x86 PREFETCH Instruction

Severity Score

4.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.

Un ataque de canal lateral basado en el tiempo y la energía aprovechando las instrucciones x86 PREFETCH en algunas CPUs de AMD podría potencialmente resultar en una filtración de información del espacio de direcciones del kernel

*Credits: N/A

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-29 CVE Reserved
2021-10-13 CVE Published
2023-05-06 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-203: Observable Discrepancy
CWE-208: Observable Timing Discrepancy

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1017	2021-10-20

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Amd Search vendor "Amd"	Athlon Firmware Search vendor "Amd" for product "Athlon Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Athlon Search vendor "Amd" for product "Athlon"	-	-	Safe
Amd Search vendor "Amd"	Athlon Pro Firmware Search vendor "Amd" for product "Athlon Pro Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Athlon Pro Search vendor "Amd" for product "Athlon Pro"	-	-	Safe
Amd Search vendor "Amd"	Epyc Firmware Search vendor "Amd" for product "Epyc Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Epyc Search vendor "Amd" for product "Epyc"	-	-	Safe
Amd Search vendor "Amd"	Ryzen Firmware Search vendor "Amd" for product "Ryzen Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Ryzen Search vendor "Amd" for product "Ryzen"	-	-	Safe
Amd Search vendor "Amd"	Ryzen Pro Firmware Search vendor "Amd" for product "Ryzen Pro Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Ryzen Pro Search vendor "Amd" for product "Ryzen Pro"	-	-	Safe