iommufd: Avoid locking internal accesses during unmap

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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.

Source published

11 Sep 2026 19:43:14 UTC

Source modified

19 Oct 2026 08:46:56 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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