{
  "threat_severity" : "Low",
  "public_date" : "2015-10-14T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: securelevel disabled after kexec",
    "id" : "1272472",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1272472"
  },
  "cvss" : {
    "cvss_base_score" : "1.9",
    "cvss_scoring_vector" : "AV:L/AC:M/Au:N/C:N/I:P/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-456",
  "details" : [ "The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot.", "A flaw was found in the way the Linux kernel handled the securelevel functionality after performing a kexec operation. A local attacker could use this flaw to bypass the security mechanism of the securelevel/secureboot combination." ],
  "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, kernel-rt and MRG-2.",
  "acknowledgement" : "Red Hat would like to thank Linn Crosetto (HP) for reporting this issue.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2015-11-19T00:00:00Z",
    "advisory" : "RHSA-2015:2411",
    "cpe" : "cpe:/a:redhat:rhel_extras_rt:7",
    "package" : "kernel-rt-0:3.10.0-327.rt56.204.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2015-11-19T00:00:00Z",
    "advisory" : "RHSA-2015:2152",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "kernel-0:3.10.0-327.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" : "kernel-rt",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2015-7837\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-7837" ],
  "name" : "CVE-2015-7837",
  "csaw" : false
}