CVE-2022-26362

 

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

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

Total changes: - 8

Description

x86 pv: Race condition in typeref acquisition 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, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• [oss-security] 20220609 Xen Security Advisory 401 v2 (CVE-2022-26362) - x86 pv: Race condition in typeref acquisition-Mailing List, Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-401.txt
• http://xenbits.xen.org/xsa/advisory-401.html
• FEDORA-2022-0142d562ca-Mailing List, Third Party Advisory
• http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html
• DSA-5184-Third Party Advisory
• FEDORA-2022-2c9f8224f8-Mailing List, Third Party Advisory
• GLSA-202208-23-Third Party Advisory

 

Keywords

NVD

 

CVE-2022-26362

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures