{
  "threat_severity" : "Moderate",
  "public_date" : "2016-07-11T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: overlayfs: missing upper dentry verification before unlink and rename",
    "id" : "1355650",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1355650"
  },
  "cvss" : {
    "cvss_base_score" : "4.7",
    "cvss_scoring_vector" : "AV:L/AC:M/Au:N/C:N/I:N/A:C",
    "status" : "verified"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-362",
  "details" : [ "fs/overlayfs/dir.c in the OverlayFS filesystem implementation in the Linux kernel before 4.6 does not properly verify the upper dentry before proceeding with unlink and rename system-call processing, which allows local users to cause a denial of service (system crash) via a rename system call that specifies a self-hardlink.", "It was found that the unlink and rename functionality in overlayfs did not verify the upper dentry for staleness. A local, unprivileged user could use the rename syscall on overlayfs on top of xfs to panic or crash the system." ],
  "statement" : "This issue is not present in the Linux kernel packages as shipped with Red Hat Enterprise Linux versions 5 and 6.\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.",
  "acknowledgement" : "This issue was discovered by CAI Qian (Red Hat).",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2016-09-15T00:00:00Z",
    "advisory" : "RHSA-2016:1875",
    "cpe" : "cpe:/a:redhat:rhel_extras_rt:7",
    "package" : "kernel-rt-0:3.10.0-327.36.1.rt56.237.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2016-09-15T00:00:00Z",
    "advisory" : "RHSA-2016:1847",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "kernel-0:3.10.0-327.36.1.el7"
  } ],
  "package_state" : [ {
    "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"
  }, {
    "product_name" : "Red Hat Enterprise MRG 2",
    "fix_state" : "Affected",
    "package_name" : "realtime-kernel",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2016-6197\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-6197" ],
  "name" : "CVE-2016-6197",
  "csaw" : false
}