CVE-2012-5515

CVE-2012-5515 describes a denial-of-service vulnerability in Xen 4.2 and earlier, affecting the XENMEM_decrease_reservation, XENMEM_populate_physmap, and XENMEM_exchange hypercalls. A local guest administrator can exploit this by providing a crafted extent_order value, leading to a long loop and system hang. This vulnerability has a CVSS score of 4.7, indicating a medium attack complexity and requiring local access, with the primary impact being a complete loss of availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.