{
  "threat_severity" : "Moderate",
  "public_date" : "2020-12-03T00:00:00Z",
  "bugzilla" : {
    "description" : "QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c",
    "id" : "1902651",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1902651"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.7",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L",
    "status" : "verified"
  },
  "cwe" : "CWE-787->CWE-122",
  "details" : [ "A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.", "A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service." ],
  "statement" : "This flaw did not affect the versions of `qemu-kvm` as shipped with Red Hat Enterprise Linux 6 and 7, as they did not include support for the MemoryRegionCache structure.",
  "acknowledgement" : "Red Hat would like to thank Alexander Bulekov for reporting this issue.",
  "affected_release" : [ {
    "product_name" : "Advanced Virtualization for RHEL 8.3.1",
    "release_date" : "2021-02-22T00:00:00Z",
    "advisory" : "RHBA-2021:0639",
    "cpe" : "cpe:/a:redhat:advanced_virtualization:8.3::el8",
    "package" : "virt:8.3-8030120210211160750.71132145"
  }, {
    "product_name" : "Advanced Virtualization for RHEL 8.3.1",
    "release_date" : "2021-02-22T00:00:00Z",
    "advisory" : "RHBA-2021:0639",
    "cpe" : "cpe:/a:redhat:advanced_virtualization:8.3::el8",
    "package" : "virt-devel:8.3-8030120210211160750.71132145"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2021-05-18T00:00:00Z",
    "advisory" : "RHSA-2021:1762",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "virt-devel:rhel-8040020210317013608.9f9e2e7e"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2021-05-18T00:00:00Z",
    "advisory" : "RHSA-2021:1762",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "virt:rhel-8040020210317013608.9f9e2e7e"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "kvm",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "qemu-kvm",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "qemu-kvm",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "qemu-kvm-ma",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "qemu-kvm-rhev",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8 Advanced Virtualization",
    "fix_state" : "Affected",
    "package_name" : "virt:8.2/qemu-kvm",
    "cpe" : "cpe:/a:redhat:advanced_virtualization:8::el8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8 Advanced Virtualization",
    "fix_state" : "Affected",
    "package_name" : "virt:8.3/qemu-kvm",
    "cpe" : "cpe:/a:redhat:advanced_virtualization:8::el8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8 Advanced Virtualization",
    "fix_state" : "Not affected",
    "package_name" : "virt:av/qemu-kvm",
    "cpe" : "cpe:/a:redhat:advanced_virtualization:8::el8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "qemu-kvm",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat OpenStack Platform 10 (Newton)",
    "fix_state" : "Out of support scope",
    "package_name" : "qemu-kvm-rhev",
    "cpe" : "cpe:/a:redhat:openstack:10"
  }, {
    "product_name" : "Red Hat OpenStack Platform 13 (Queens)",
    "fix_state" : "Out of support scope",
    "package_name" : "qemu-kvm-rhev",
    "cpe" : "cpe:/a:redhat:openstack:13"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2020-27821\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-27821\nhttps://www.openwall.com/lists/oss-security/2020/12/16/6" ],
  "name" : "CVE-2020-27821",
  "csaw" : false
}