CVE-2026-89447

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

iommufd: Avoid locking internal accesses during unmap

iommufd_access_notify_unmap() skips internal accesses because they do

not have an external unmap callback to invoke.

However, the current test calls iommufd_lock_obj() before checking

whether the access is internal. If iommufd_lock_obj() succeeds, the loop

then sees the internal access and continues, bypassing the matching

iommufd_put_object() used by the normal unmap path. This leaks the

object reference taken by iommufd_lock_obj().

Check for internal accesses first so skipped entries are never locked.