{
  "threat_severity" : "Important",
  "public_date" : "2017-06-20T00:00:00Z",
  "bugzilla" : {
    "description" : "xen: stale P2M mappings due to insufficient error checking (XSA-222)",
    "id" : "1458876",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1458876"
  },
  "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" : [ "Xen through 4.8.x does not validate memory allocations during certain P2M operations, which allows guest OS users to obtain privileged host OS access, aka XSA-222." ],
  "acknowledgement" : "Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Julien Grall (ARM) 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-2017-10918\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-10918\nhttp://xenbits.xen.org/xsa/advisory-222.html" ],
  "name" : "CVE-2017-10918",
  "mitigation" : {
    "value" : "On x86, specifying \"hap_1gb=0 hap_2mb=0\" on the hypervisor command\nline will avoid the vulnerability.\nAlternatively, running all x86 HVM guests in shadow mode will also\navoid this vulnerability.  (For example, by specifying \"hap=0\" in the\nxl domain configuration file.)\nThere is no known mitigation on ARM systems.",
    "lang" : "en:us"
  },
  "csaw" : false
}