CVE-2022-23035

Insufficient cleanup of passed-through device IRQs The management of IRQs
associated with physical devices exposed to x86 HVM guests involves an
iterative operation in particular when cleaning up after the guest’s use of
the device. In the case where an interrupt is not quiescent yet at the time
this cleanup gets invoked, the cleanup attempt may be scheduled to be
retried. When multiple interrupts are involved, this scheduling of a retry
may get erroneously skipped. At the same time pointers may get cleared
(resulting in a de-reference of NULL) and freed (resulting in a
use-after-free), while other code would continue to assume them to be
valid.

Notes