{
  "threat_severity" : "Important",
  "public_date" : "2017-06-20T00:00:00Z",
  "bugzilla" : {
    "description" : "xen: x86: insufficient reference counts during shadow emulation (XSA-219)",
    "id" : "1458873",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1458873"
  },
  "cvss3" : {
    "cvss3_base_score" : "8.5",
    "cvss3_scoring_vector" : "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
    "status" : "draft"
  },
  "details" : [ "The shadow-paging feature in Xen through 4.8.x mismanages page references and consequently introduces a race condition, which allows guest OS users to obtain Xen privileges, aka XSA-219." ],
  "acknowledgement" : "Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Andrew Cooper (Citrix) as the original reporter.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Will not fix",
    "package_name" : "xen",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2017-10915\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-10915\nhttp://xenbits.xen.org/xsa/advisory-219.html" ],
  "name" : "CVE-2017-10915",
  "mitigation" : {
    "value" : "Where the HVM guest is explicitly configured to use shadow paging (eg\nvia the `hap=0' xl domain configuration file parameter), changing to\nHAP (eg by setting `hap=1') will avoid exposing the vulnerability to\nthose guests.  HAP is the default (in upstream Xen), where the\nhardware supports it; so this mitigation is only applicable if HAP has\nbeen disabled by configuration.\n(This mitigation is not applicable to PV guests.)",
    "lang" : "en:us"
  },
  "csaw" : false
}