ALPINE-CVE-2020-15564
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.
Risk Scores
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.18 | xen | 4.0.1-r0, 4.0.1-r1, 4.0.1-r3 |
| Alpine:v3.22 | xen | 4.4.1-r6, 4.3.0-r4, 4.3.0-r6 |
| Alpine:v3.16 | xen | 0, 4.0.1-r0, 4.0.1-r1 |
| Alpine:v3.11 | xen | 4.1.2-r4, 4.1.2-r5, 4.1.2-r6 |
| Alpine:v3.12 | xen | 4.4.1-r5, 4.2.1-r2, 4.9.1-r2 |
| Alpine:v3.9 | xen | 4.4.1-r8, 4.4.1-r7, 4.4.1-r6 |
| Alpine:v3.23 | xen | 4.7.0-r2, 0, 4.0.1-r0 |
| Alpine:v3.21 | xen | 4.2.1-r10, 4.2.1-r1, 4.2.1-r0 |
| Alpine:v3.19 | xen | 0, 4.0.1-r3, 4.1.0-r0 |
| Alpine:v3.20 | xen | 4.9.1-r3, 0, 4.0.1-r0 |
| Alpine:v3.14 | xen | 4.12.0-r0, 0, 4.0.1-r0 |
| Alpine:v3.13 | xen | 4.2.2-r8, 4.9.1-r2, 4.9.1-r1 |
| Alpine:v3.10 | xen | 4.3.2-r4, 4.9.1-r3, 4.9.1-r2 |
| Alpine:v3.17 | xen | 4.4.1-r5, 4.12.0-r0, 4.11.1-r1 |
| Alpine:v3.15 | xen | 4.9.1-r3, 4.2.1-r1, 4.2.1-r0 |
Timeline
- Jul 7, 2020 CVE Published
- Dec 3, 2025 CVE Updated
- Apr 30, 2026 Distribution Patch