CVE-2022-26362 Information

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.

Reference

http://www.openwall.com/lists/oss-security/2022/06/09/3 https://xenbits.xenproject.org/xsa/advisory-401.txt http://xenbits.xen.org/xsa/advisory-401.html