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CVE-2022-26362

Status Candidate

Overview

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.

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
Xen TLB Flush Bypass
Posted Jul 11, 2022
Authored by Jann Horn, Google Security Research

Xen's _get_page_type() contains an ABAC cmpxchg() race, where the code incorrectly assumes that if it reads a specific type_info value, and then later cmpxchg() succeeds, the type_info can't have changed in between.

tags | exploit
advisories | CVE-2022-26362
SHA-256 | 88fe91f31a1fa5b68860cd0112d829c44076320a17d995120f8a3d426cc59af7
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