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{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue.", "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"}, "csaw": false, "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."], "name": "CVE-2020-15564", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel-xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-07-07T12:00:00Z", "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"], "statement": "Only ARM systems are vulnerable, x86 systems are not affected by this flaw.", "threat_severity": "Moderate"}