NVIDIA vGPU Manager (vGPU plugin): MULTI-TENANT ISOLATION: time-of-check to time-of-use on a shared resource

Impact

MULTI-TENANT ISOLATION: time-of-check to time-of-use on a shared resource between guest and host plugin. A tenant that wins the race gets host-side information disclosure or crashes the shared GPU. vGPU 8.x before 8.4, 9.x before 9.4, 10.x before 10.3.

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