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{"bugzilla": {"description": "xen: Long latency populate-on-demand operation is not preemptible on x86", "id": "1272529", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1272529"}, "csaw": false, "details": ["The p2m_pod_emergency_sweep function in arch/x86/mm/p2m-pod.c in Xen 3.4.x, 3.5.x, and 3.6.x is not preemptible, which allows local x86 HVM guest administrators to cause a denial of service (CPU consumption and possibly reboot) via crafted memory contents that triggers a \"time-consuming linear scan,\" related to Populate-on-Demand."], "mitigation": {"lang": "en:us", "value": "Running only PV guests will avoid this issue. Running HVM guest without enabling Populate-on-Demand mode (so, ensuring that maxmem==memory) will avoid this issue."}, "name": "CVE-2015-7970", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2015-10-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-7970\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-7970\nhttp://xenbits.xen.org/xsa/advisory-150.html"], "threat_severity": "Moderate"}