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Vulnerability · Published Jul 7, 2020 · Assigned by mitre

CVE-2020-15564

Medium 6.5

In plain English

A medium-severity security flaw in the xen package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)0.4%top 65.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20xen4.13.1-r4ALPINE-CVE-2020-15564
Alpine:v3.21xen4.13.1-r4ALPINE-CVE-2020-15564
Alpine:v3.22xen4.13.1-r4ALPINE-CVE-2020-15564
Alpine:v3.23xen4.13.1-r4ALPINE-CVE-2020-15564
Alpine:v3.24xen4.13.1-r4ALPINE-CVE-2020-15564
Debian:12xen4.11.4+24-gddaaccbbab-1DEBIAN-CVE-2020-15564
Debian:13xen4.11.4+24-gddaaccbbab-1DEBIAN-CVE-2020-15564
Debian:14xen4.11.4+24-gddaaccbbab-1DEBIAN-CVE-2020-15564

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References