Improper Cleanup in Xen Hypervisor Affects Virtual Device Management

CVE-2026-62437

What is CVE-2026-62437?

The vulnerability in the Xen Hypervisor involves a flaw in the cleanup process during the termination of guests. Specifically, when guests are terminated, there are critical cleanup tasks that need to be performed, especially concerning PCI devices and the associated IRQ tracking structures. The problematic sequence occurs when a guest is terminated; although cleaning up the IRQs generally happens at the beginning, if the machine's device model is allowed to rebind IRQs after this point, it can lead to residual tracking structures not being adequately cleared. This could potentially allow for unintended interactions or memory references, which may compromise the integrity of the virtualization environment.

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