{
  "threat_severity" : "Moderate",
  "public_date" : "2011-12-14T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: kvm: pit timer with no irqchip crashes the system",
    "id" : "769721",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=769721"
  },
  "cvss" : {
    "cvss_base_score" : "4.9",
    "cvss_scoring_vector" : "AV:L/AC:L/Au:N/C:N/I:N/A:C",
    "status" : "verified"
  },
  "details" : [ "The create_pit_timer function in arch/x86/kvm/i8254.c in KVM 83, and possibly other versions, does not properly handle when Programmable Interval Timer (PIT) interrupt requests (IRQs) when a virtual interrupt controller (irqchip) is not available, which allows local users to cause a denial of service (NULL pointer dereference) by starting a timer." ],
  "statement" : "This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4 and Red Hat Enterprise MRG as they did not provide support for the KVM subsystem. It has been addressed in Red Hat Enterprise 5 and 6 via https://rhn.redhat.com/errata/RHSA-2012-0051.html and https://rhn.redhat.com/errata/RHSA-2012-0350.html.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "release_date" : "2012-01-23T00:00:00Z",
    "advisory" : "RHSA-2012:0051",
    "cpe" : "cpe:/a:redhat:rhel_virtualization:5",
    "package" : "kvm-0:83-239.el5_7.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "release_date" : "2012-03-06T00:00:00Z",
    "advisory" : "RHSA-2012:0350",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6",
    "package" : "kernel-0:2.6.32-220.7.1.el6"
  } ],
  "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" : "Affected",
    "package_name" : "kvm",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise MRG 2",
    "fix_state" : "Not affected",
    "package_name" : "realtime-kernel",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2011-4622\nhttps://nvd.nist.gov/vuln/detail/CVE-2011-4622" ],
  "name" : "CVE-2011-4622",
  "csaw" : false
}