CVE-2026-43161

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Skip dev-iotlb flush for inaccessible PCIe device without scalable mode PCIe endpoints with ATS enabled and passed through to userspace e.g., QEMU, DPDK can hard-lock the host when their link drops, either by surprise...

CVE-2026-43161

CVE-2026-43161 is a Linux kernel IOMMU VT-d vulnerability related to ATS invalidation when a PCIe endpoint loses connection. In scalable-mode-disabled/unsupported systems, an endpoint link drop can cause the IOMMU to wait indefinitely for an ATS invalidation, leading to a host hard-lock (notably ...

Citrix Hypervisor Cannot Boot VM - Inaccessible_boot_device

After booting the VM an "Inaccessible Boot Device" error appears. The error may also appear as "The boot selection failed because a required device is inaccessible". This may be a critical VM that needs to be restored fast...