CVE-2022-26364

 

Published at: - 09-06-2022 07:15

Last modified: - 24-08-2022 08:35

Total changes: - 8

Description

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://xenbits.xenproject.org/xsa/advisory-402.txt
• [oss-security] 20220609 Xen Security Advisory 402 v4 (CVE-2022-26363,CVE-2022-26364) - x86 pv: Insufficient care with non-coherent mappings-Mailing List, Third Party Advisory
• http://xenbits.xen.org/xsa/advisory-402.html
• FEDORA-2022-0142d562ca-Mailing List, Third Party Advisory
• http://packetstormsecurity.com/files/167710/Xen-PV-Guest-Non-SELFSNOOP-CPU-Memory-Corruption.html
• DSA-5184-Third Party Advisory
• FEDORA-2022-2c9f8224f8-Mailing List, Third Party Advisory
• GLSA-202208-23-Third Party Advisory

 

Keywords

NVD

 

CVE-2022-26364

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures