CVE-2021-28690

Debian Security Advisory 4931-1

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

x86: TSX Async Abort protections not restored after S3 This issue relates to the TSX Async Abort speculative security vulnerability. Please see https://xenbits.xen.org/xsa/advisory-305.html for details. Mitigating TAA by disabling TSX (the default and preferred option) requires selecting a non-default setting in MSR_TSX_CTRL. This setting isn't restored after S3 suspend.

x86: Las protecciones TSX Async Abort no son restauradas después de S3. Este problema está relacionado con una vulnerabilidad de seguridad especulativa TSX Async Abort. Consulte https://xenbits.xen.org/xsa/advisory-305.html para mayor detalles. La mitigación de TAA al desactivar TSX (la opción predeterminada y preferida) requiere seleccionar una configuración no predeterminada en MSR_TSX_CTRL. Esta configuración no se restaura después de la suspensión de S3

Multiple vulnerabilities have been found in Xen, the worst of which could result in privilege escalation. Versions less than 4.15.0-r1 are affected.

*Credits: This issue was discovered by Andrew Cooper of Citrix.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-18 CVE Reserved
2021-06-28 CVE Published
2024-08-03 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://xenbits.xenproject.org/xsa/advisory-377.txt	2021-09-21

URL	Date	SRC
https://security.gentoo.org/glsa/202107-30	2021-09-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				>= 4.12 <= 4.15.0 Search vendor "Xen" for product "Xen" and version " >= 4.12 <= 4.15.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.15.0 Search vendor "Xen" for product "Xen" and version "4.15.0"		rc1		Affected