CVE-2026-23553

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

CVE-2026-23553

The Xen hypervisor contains a flaw in its context switch logic where it attempts to skip an Indirect Branch Prediction Barrier (IBPB) when a vCPU returns to a CPU where it was the previous vCPU to run. While this maintains isolation between vCPUs, it prevents the guest kernel from correctly isola...

Linux Kernel Security Vulnerabilities

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that originates in the net:txgbe module when using MSI/INTx interrupts, where shared interrupts are still processed during...