{
  "threat_severity" : "Moderate",
  "public_date" : "2020-07-07T12:00:00Z",
  "bugzilla" : {
    "description" : "xen: missing alignment check in VCPUOP_register_vcpu_info leads to DoS (XSA-327)",
    "id" : "1851470",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1851470"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-20",
  "details" : [ "An issue was discovered in Xen through 4.13.x, allowing Arm guest OS users to cause a hypervisor crash because of a missing alignment check in VCPUOP_register_vcpu_info. The hypercall VCPUOP_register_vcpu_info is used by a guest to register a shared region with the hypervisor. The region will be mapped into Xen address space so it can be directly accessed. On Arm, the region is accessed with instructions that require a specific alignment. Unfortunately, there is no check that the address provided by the guest will be correctly aligned. As a result, a malicious guest could cause a hypervisor crash by passing a misaligned address. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). All Xen versions are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected.", "An input validation flaw was found in Xen. A malicious guest administrator could abuse this flaw to cause a hypervisor crash by passing a misaligned address, resulting in a Denial of Service condition (DoS)." ],
  "statement" : "Only ARM systems are vulnerable, x86 systems are not affected by this flaw.",
  "acknowledgement" : "Red Hat would like to thank the Xen project for reporting this issue.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "kernel-xen",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2020-15564\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-15564\nhttps://xenbits.xen.org/xsa/advisory-327.html" ],
  "name" : "CVE-2020-15564",
  "csaw" : false
}