QID 198497

The kvm hypervisor implementation for amd processors in the linux kernel allowed a guest vm to disable restrictions on vmload/vmsave in a nested guest.
The kvm hypervisor implementation for amd processors in the linux kernel did not properly prevent a guest vm from enabling avic in nested guest vms.
The can broadcast manger (bcm) protocol implementation in the linux kernel did not properly initialize memory in some situations.
The joystick device interface in the linux kernel did not properly validate data passed via an ioctl().the virtio console implementation in the linux kernel did not properly validate input lengths in some situations.


Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

an attacker in a guest vm could use this to read or write portions of the host's physical memory. (
Cve-2021-3656).
An attacker in a guest vm could use this to write to portions of the host's physical memory. (
Cve-2021-3653).
A local attacker could use this to expose sensitive information (kernel memory) (cve-2021-34693).
A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code on systems with a joystick device registered. (
Cve-2021-3612).
A local attacker could possibly use this to cause a denial of service (system crash) (cve-2021-38160).