In smmu_find_ste of smmu.c, there is a possible way to retain stale translation lookaside buffer entries across stream identifiers due to a…

In smmu_find_ste of smmu.c, there is a possible way to retain stale translation lookaside buffer entries across stream identifiers due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.