CVE-2022-33745

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary.

Un vaciado insuficiente del TLB para huéspedes x86 PV en modo de sombra Para la migración, así como para trabajar en torno a los kernels que no son conscientes de L1TF (véase XSA-273), los huéspedes PV pueden ejecutarse en modo de paginación de sombra. Para abordar XSA-401, el código fue movido dentro de una función en Xen. Este movimiento de código pasó por alto una variable que cambiaba de significado/valor entre las posiciones de código antiguas y nuevas. El uso ahora erróneo de la variable conllevaba a una condición errónea de vaciado de la TLB, omitiendo el vaciado cuando era necesario.

*Credits: This issue was discovered by Charles Arnold of SUSE.

CVSS Scores

NISTv3.1 8.8

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-06-15 CVE Reserved
2022-07-26 CVE Published
2023-10-31 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2022/07/26/2	2023-11-07
http://www.openwall.com/lists/oss-security/2022/07/26/3	2023-11-07
http://xenbits.xen.org/xsa/advisory-408.html	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM	2023-11-07
https://www.debian.org/security/2022/dsa-5272	2023-11-07
https://xenbits.xenproject.org/xsa/advisory-408.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
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
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