Xen · Xen · CVE-2022-23035
**Name of the Vulnerable Software and Affected Versions**
Xen (affected versions not specified)
**Description**
The issue arises from insufficient cleanup of passed-through device IRQs associated with physical devices exposed to x86 HVM guests. This involves an iterative operation, particularly when cleaning up after the guest's use of the device. If an interrupt is not quiescent yet at the time this cleanup gets invoked, the cleanup attempt may be scheduled to be retried. However, 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.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.