{
  "threat_severity" : "Moderate",
  "public_date" : "2016-03-31T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: ext4 filesystem page fault race condition with fallocate call.",
    "id" : "1323577",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1323577"
  },
  "cvss" : {
    "cvss_base_score" : "4.7",
    "cvss_scoring_vector" : "AV:L/AC:M/Au:N/C:N/I:C/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-362",
  "details" : [ "Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local users to cause a denial of service (disk corruption) by writing to a page that is associated with a different user's file after unsynchronized hole punching and page-fault handling.", "A flaw was found in the Linux kernel when attempting to \"punch a hole\" in files existing on an ext4 filesystem. When punching holes into a file races with the page fault of the same area, it is possible that freed blocks remain referenced from page cache pages mapped to process' address space." ],
  "statement" : "This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5 and 6.\nThis issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 7 and MRG-2 kernels.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2017-08-01T00:00:00Z",
    "advisory" : "RHSA-2017:2077",
    "cpe" : "cpe:/a:redhat:rhel_extras_rt:7",
    "package" : "kernel-rt-0:3.10.0-693.rt56.617.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2017-08-01T00:00:00Z",
    "advisory" : "RHSA-2017:1842",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "kernel-0:3.10.0-693.el7"
  }, {
    "product_name" : "Red Hat Enterprise MRG 2",
    "release_date" : "2017-09-06T00:00:00Z",
    "advisory" : "RHSA-2017:2669",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2:server:el6",
    "package" : "kernel-rt-1:3.10.0-693.2.1.rt56.585.el6rt"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 4",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2015-8839\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-8839" ],
  "name" : "CVE-2015-8839",
  "csaw" : false
}