CVE-2022-33745

 

Published at: - 26-07-2022 03:15

Last modified: - 12-08-2022 05:15

Total changes: - 4

Description

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://xenbits.xenproject.org/xsa/advisory-408.txt
• http://xenbits.xen.org/xsa/advisory-408.html
• [oss-security] 20220726 Xen Security Advisory 408 v2 (CVE-2022-33745) - insufficient TLB flush for x86 PV guests in shadow mode-Mailing List, Patch, Third Party Advisory
• [oss-security] 20220726 Xen Security Advisory 408 v3 (CVE-2022-33745) - insufficient TLB flush for x86 PV guests in shadow mode-Mailing List, Patch, Third Party Advisory
• FEDORA-2022-4f7cd241e2-Mailing List, Third Party Advisory
• FEDORA-2022-a0d7a5eaf2-

 

Keywords

NVD

 

CVE-2022-33745

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures