Description
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush context cache with correct SID when tearing down aliases domain_context_clear_one() and device_pasid_table_teardown() are both invoked once per DMA alias of a device. Each function locates the context entry using the bus/devfn pair provided by the pci_for_each_dma_alias() callback, then calls intel_context_flush_no_pasid(), which constructs a device-selective context-cache invalidation from info->bus and info->devfn (that is, always the requester ID of the device itself). As a result, for every alias other than the device’s own RID, the context entry that was just cleared in memory is never invalidated in the context cache. Hardware may continue using that stale cached entry. In the scalable-mode teardown path, intel_pasid_free_table() can then free the PASID directory still referenced by that stale entry, allowing the IOMMU to walk freed memory. Fix this by passing the source ID of the entry being torn down to intel_context_flush_no_pasid(), instead of deriving it from @info.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f90584f4beb84211c4d21b319cc13f391fe9f3c2 to < 3eb6ad14ef359e426cff14942e220de101cdbe84affectedf90584f4beb84211c4d21b319cc13f391fe9f3c2 to < a803141597d61dc0511f7cd849625e17d042ca8aaffectedf90584f4beb84211c4d21b319cc13f391fe9f3c2 to < 5baddf100b3be730912485648cbaae5e3a251923affectedf90584f4beb84211c4d21b319cc13f391fe9f3c2 to < c54e4ae971b98e8d650400137d332cee56c03f55affected
Linux Linux
Default version status: affected
6.11affected0 to < 6.11unaffected6.12.114 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected