CVE-2022-26363

Severity Score

6.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, Xen's safety logic doesn't account for CPU-induced cache non-coherency; cases where the CPU can cause the content of the cache to be different to the content in main memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.

x86 pv: Cuidado insuficiente con los mapeos no coherentes T[este registro de información CNA es relacionado con múltiples CVEs; el texto explica qué aspectos/vulnerabilidades corresponden a cada CVE]. Xen mantiene un recuento de referencias de tipo para las páginas, además de un recuento de referencias regulares. Este esquema es usado para mantener invariantes requeridos para la seguridad de Xen, por ejemplo, los invitados de PV no pueden tener acceso directo de escritura a las tablas de páginas; las actualizaciones necesitan ser auditadas por Xen. Desafortunadamente, la lógica de seguridad de Xen no presenta en cuenta la no coherencia de la caché inducida por la CPU; casos en los que la CPU puede causar que el contenido de la caché sea diferente al contenido en la memoria principal. En estos casos, la lógica de seguridad de Xen puede concluir incorrectamente que el contenido de una página es seguro

*Credits: This issue was discovered by Jann Horn of Google Project Zero.

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-03-02 CVE Reserved
2022-06-09 CVE Published
2023-12-31 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (7)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2022/06/09/4	Mailing List

URL	Date	SRC

URL	Date	SRC
http://xenbits.xen.org/xsa/advisory-402.html	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q	2023-11-07
https://security.gentoo.org/glsa/202208-23	2023-11-07
https://www.debian.org/security/2022/dsa-5184	2023-11-07
https://xenbits.xenproject.org/xsa/advisory-402.txt	2023-11-07

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"				*		x86		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				36 Search vendor "Fedoraproject" for product "Fedora" and version "36"		-		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