CVE-2022-26362

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.

Weakness classification

• nvd@nist.gov: CWE-362

Primary references

• security@xen.org — Third Party Advisory, VDB Entry
• security@xen.org — Mailing List, Third Party Advisory
• security@xen.org — Patch, Vendor Advisory
• security@xen.org
• security@xen.org
• security@xen.org — Third Party Advisory
• security@xen.org — Third Party Advisory
• security@xen.org — Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108