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CVE ID: CVE-2022-26364

Last updated: July 23, 2022, 4:15 a.m.

Severity: HIGH


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.

Severity score: 10.0 Base score: 7.2 Exploitability score: 3.9 Confidentiality impact: COMPLETE Integrity impact: COMPLETE User interaction required: False Published: June 9, 2022, 5:15 p.m. Data type: CVE Data format: MITRE Assigner: Problem type: NVD-CWE-noinfo Reference url: Reference name: Reference source: MISC CVE version: 2.0 Vector string: AV:L/AC:L/Au:N/C:C/I:C/A:C Access vector: LOCAL Access complexity: LOW Authentication: NONE Base severity: AcInsf info: False Obtain all priviledges: False User privilege: False Other privilege: False

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