NVIDIA vGPU Manager (vGPU plugin): MULTI-TENANT ISOLATION: the plugin takes a value from the guest, casts

Impact

MULTI-TENANT ISOLATION: the plugin takes a value from the guest, casts it to a pointer and dereferences it. A tenant chooses a host address to read - arbitrary host-memory disclosure or a crash. vGPU 8.x before 8.6, 11.0 before 11.3.

Who can reach it

Any unprivileged user inside a guest VM with a vGPU.

What to do

Upgrade the vGPU Manager on the hypervisor host to the fixed vGPU release. The host component is a kernel module inside the hypervisor, so this is a full node drain: evacuate or power off every tenant VM on the host, upgrade, reboot the host. Guest drivers must be kept within the supported version skew and updated per VM (guest reboot). No VBIOS flash, but expect a maintenance window per host and a matching hypervisor-vendor package (VMware/Citrix/KVM/Nutanix builds ship separately).

References