{
  "threat_severity" : "Moderate",
  "public_date" : "2015-10-29T00:00:00Z",
  "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"
  },
  "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.\"" ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "xen",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  } ],
  "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" ],
  "name" : "CVE-2015-7972",
  "mitigation" : {
    "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.",
    "lang" : "en:us"
  },
  "csaw" : false
}