[REJECTED CVE] A vulnerability has been identified in the Linux kernel's IOMMU (iommu/vt-d) subsystem, where calling qi_submit_sync() with zero invalidation descriptors could lead to a soft lockup due to misinterpreted descriptor statuses. An attacker with control over IOMMU operations could potentially trigger a deadlock, causing system instability.

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix potential lockup if qi_submit_sync called with 0 count If qi_submit_sync() is invoked with 0 invalidation descriptors (for instance, for DMA draining purposes), we can run into a bug where a submitting thread fails to detect the completion of invalidation_wait. Subsequently, this led to a soft lockup. Currently, there is no impact by this bug on the existing users because no callers are submitting invalidations with 0 descriptors. This fix will enable future users (such as DMA drain) calling qi_submit_sync() with 0 count. Suppose thread T1 invokes qi_submit_sync() with non-zero descriptors, while concurrently, thread T2 calls qi_submit_sync() with zero descriptors. Both threads then enter a while loop, waiting for their respective descriptors to complete. T1 detects its completion (i.e., T1's invalidation_wait status changes to QI_DONE by HW) and proceeds to call reclaim_free_desc() to reclaim all...

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