{
  "threat_severity" : "Moderate",
  "public_date" : "2015-12-10T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: User triggerable crash from race between key read and rey revoke",
    "id" : "1291197",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1291197"
  },
  "cvss" : {
    "cvss_base_score" : "4.6",
    "cvss_scoring_vector" : "AV:L/AC:L/Au:S/C:N/I:N/A:C",
    "status" : "draft"
  },
  "cwe" : "CWE-476",
  "details" : [ "The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.", "A NULL-pointer dereference flaw was found in the kernel, which is caused by a race between revoking a user-type key and reading from it. The issue could be triggered by an unprivileged user with a local account, causing the kernel to crash (denial of service)." ],
  "statement" : "This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5,6 and 7 and may be addressed in a future update.",
  "acknowledgement" : "Red Hat would like to thank Dmitry Vyukov (Google) for reporting this issue.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Will not fix",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Will not fix",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Will not fix",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Will not fix",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise MRG 2",
    "fix_state" : "Will not fix",
    "package_name" : "realtime-kernel",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2015-7550\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-7550" ],
  "name" : "CVE-2015-7550",
  "csaw" : false
}