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{"bugzilla": {"description": "xen: populate-on-demand balloon size inaccuracy can crash guests on x86", "id": "1276120", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1276120"}, "csaw": false, "cvss": {"cvss_base_score": "4.7", "cvss_scoring_vector": "AV:L/AC:M/Au:N/C:N/I:N/A:C", "status": "draft"}, "details": ["The (1) libxl_set_memory_target function in tools/libxl/libxl.c and (2) libxl__build_post function in tools/libxl/libxl_dom.c in Xen 3.4.x through 4.6.x do not properly calculate the balloon size when using the populate-on-demand (PoD) system, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors related to \"heavy memory pressure.\""], "mitigation": {"lang": "en:us", "value": "Reducing the guest's memory target, after guest startup, can cause the\nguest's ballon driver to eliminate the PoD discrepancy. If the guest\nsuccessfully balloons down, it will no longer be vulnerable."}, "name": "CVE-2015-7972", "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-2015-7972\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-7972\nhttp://xenbits.xen.org/xsa/advisory-153.html"], "threat_severity": "Moderate"}