{
  "threat_severity" : "Important",
  "public_date" : "2018-05-15T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: use-after-free in fs/xfs/xfs_super.c",
    "id" : "1743547",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1743547"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.8",
    "cvss3_scoring_vector" : "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-416",
  "details" : [ "An issue was discovered in fs/xfs/xfs_super.c in the Linux kernel before 4.18. A use after free exists, related to xfs_fs_fill_super failure.", "A flaw was found in the Linux kernel's implementation of the XFS filesystem. A key data structure (sb->s_fs_info)  may not be de-allocated when the system is under memory pressure. This same data structure is then used at a later time during filesystem operations. This could allow a local attacker who is able to groom memory to place an attacker-controlled data structure in this location and create a use-after-free situation which can result in memory corruption or privilege escalation." ],
  "statement" : "Red Hat Enterprise Linux 7.6.z had fixed this flaw mid release without it being recognised as a CVE.  Prior releases of Red Hat Enterprise Linux EUS/AUS will still require the fix to be secure.  Trackers have been made and fixes will be available as part of the standard release cycle.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 7.2 Advanced Update Support",
    "release_date" : "2020-03-03T00:00:00Z",
    "advisory" : "RHSA-2020:0661",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.2",
    "package" : "kernel-0:3.10.0-327.85.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.3 Advanced Update Support",
    "release_date" : "2020-01-21T00:00:00Z",
    "advisory" : "RHSA-2020:0178",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.3",
    "package" : "kernel-0:3.10.0-514.72.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.3 Telco Extended Update Support",
    "release_date" : "2020-01-21T00:00:00Z",
    "advisory" : "RHSA-2020:0178",
    "cpe" : "cpe:/o:redhat:rhel_tus:7.3",
    "package" : "kernel-0:3.10.0-514.72.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions",
    "release_date" : "2020-01-21T00:00:00Z",
    "advisory" : "RHSA-2020:0178",
    "cpe" : "cpe:/o:redhat:rhel_e4s:7.3",
    "package" : "kernel-0:3.10.0-514.72.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.4 Advanced Update Support",
    "release_date" : "2020-02-25T00:00:00Z",
    "advisory" : "RHSA-2020:0592",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.4",
    "package" : "kernel-0:3.10.0-693.64.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.4 Telco Extended Update Support",
    "release_date" : "2020-02-25T00:00:00Z",
    "advisory" : "RHSA-2020:0592",
    "cpe" : "cpe:/o:redhat:rhel_tus:7.4",
    "package" : "kernel-0:3.10.0-693.64.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions",
    "release_date" : "2020-02-25T00:00:00Z",
    "advisory" : "RHSA-2020:0592",
    "cpe" : "cpe:/o:redhat:rhel_e4s:7.4",
    "package" : "kernel-0:3.10.0-693.64.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.5 Extended Update Support",
    "release_date" : "2020-02-19T00:00:00Z",
    "advisory" : "RHSA-2020:0543",
    "cpe" : "cpe:/o:redhat:rhel_eus:7.5",
    "package" : "kernel-0:3.10.0-862.48.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise MRG 2",
    "release_date" : "2020-02-26T00:00:00Z",
    "advisory" : "RHSA-2020:0609",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2:server:el6",
    "package" : "kernel-rt-1:3.10.0-693.64.1.rt56.662.el6rt"
  } ],
  "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 Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-alt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2018-20976\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-20976" ],
  "name" : "CVE-2018-20976",
  "csaw" : false
}