CVE-2012-4539

CVE-2012-4539 describes a denial-of-service vulnerability affecting Xen versions 4.0 through 4.2 when running 32-bit x86 PV guests on 64-bit hypervisors. A local guest OS administrator can trigger an infinite loop and system hang or crash by providing invalid arguments to the GNTTABOP_get_status_frames hypercall. This vulnerability has a low severity CVSS score of 2.1, indicating a local attack vector with low complexity and a potential impact of partial availability loss. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.