Memory Access Vulnerability in Arm Architecture for Xen Hypervisor

CVE-2022-23033

What is CVE-2022-23033?

This vulnerability allows an attacker with access to a guest operating system running on an Arm architecture to exploit flaws in the p2m pagetable handling within the Xen Hypervisor. Due to improper clearing of pagetable entries, particularly when the valid bit is not set, an attacker can retain access to memory pages even after they are supposed to be freed and reused by Xen for different purposes. By leveraging this flaw, a guest OS may inadvertently retain access to previously allocated memory, potentially leading to unauthorized data access and compromise of both security and stability within the virtualized environment.

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References