{
  "threat_severity" : "Moderate",
  "public_date" : "2011-02-22T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: /sys/kernel/debug/acpi/custom_method can bypass module restrictions",
    "id" : "680841",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=680841"
  },
  "cvss" : {
    "cvss_base_score" : "6.0",
    "cvss_scoring_vector" : "AV:L/AC:H/Au:S/C:C/I:C/A:C",
    "status" : "verified"
  },
  "details" : [ "drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347." ],
  "statement" : "The version of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and 6 as they did not include upstream commit a1a541d8 and a25ee920 that introduced the problem. This has been addressed in Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1253.html.\nNotes:\nThis requires debugfs to be mounted on a local system in order to have access\nto the custom_method file. Debugfs is not mounted by default. You need to run\n\"mount -t debugfs nodev /sys/kernel/debug\" as root first.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise MRG 2",
    "release_date" : "2011-09-12T00:00:00Z",
    "advisory" : "RHSA-2011:1253",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2:server:el6",
    "package" : "kernel-rt-0:2.6.33.9-rt31.75.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-2011-1021\nhttps://nvd.nist.gov/vuln/detail/CVE-2011-1021" ],
  "name" : "CVE-2011-1021",
  "csaw" : false
}