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CVE-2022-26363

Status Candidate

Overview

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.

Related Files

Debian Security Advisory 5184-1
Posted Jul 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5184-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in privilege escalation. In addition this updates provides mitigations for the "Retbleed" speculative execution attack and the "MMIO stale data" vulnerabilities.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2022-21123, CVE-2022-21125, CVE-2022-21166, CVE-2022-23816, CVE-2022-23825, CVE-2022-26362, CVE-2022-26363, CVE-2022-26364, CVE-2022-29900
SHA-256 | a6ef7fc52f33a44647f11ad73447e266d15867256950bda60e55581335321822
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