CVE-2026-97478

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

virt: acrn: Fix irqfd use-after-free during eventfd shutdown

acrn_irqfd_deassign() and the eventfd EPOLLHUP wakeup can race and free

the same struct hsm_irqfd:

CPU0 CPU1

---- ----

eventfd_release()

wake_up_poll(EPOLLHUP)

hsm_irqfd_wakeup()

queue_work(&irqfd->shutdown)

acrn_irqfd_deassign()

hsm_irqfd_shutdown()

list_del_init()

eventfd_ctx_remove_wait_queue()

eventfd_ctx_put()

kfree(irqfd)

hsm_irqfd_shutdown_work()

container_of(work, ..., shutdown)

irqfd->vm <-- use-after-free

The deassign path freed the irqfd while a shutdown work item was

already queued by

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References