Total vulnerabilities in the database
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.
| Software | From | Fixed in |
|---|---|---|
| xen / xen | 4.8.0 | 4.13.1.x |
| debian / debian_linux | 10.0 | 10.0.x |
| fedoraproject / fedora | 31 | 31.x |
| fedoraproject / fedora | 32 | 32.x |