(In the Linux kernel, the following vulnerability has been resolved: i ...)

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Tear down scalable-mode context on probe failure intel_pasid_setup_sm_context() walks a PCI device’s DMA aliases via pci_for_each_dma_alias() and programs a scalable-mode context entry for each RID. For a device with a dma_alias_mask, the callback is invoked once for the device’s own RID and once for each alias bit, all with the same pci_dev, so device_pasid_table_setup() runs for multiple RIDs. pci_for_each_dma_alias() stops at the first callback error. Therefore, a failure partway through the walk can leave context entries for already processed RIDs present and still pointing to the device’s PASID table. On this error path, intel_iommu_probe_device() currently jumps directly to intel_pasid_free_table(), which frees the PASID table without first tearing down those context entries. The IOMMU may then walk a present context entry whose PASID table pointer references freed memory. intel_iommu_relea

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

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Tear down scalable-mode context on probe failure intel_pasid_setup_sm_context() walks a PCI device’s DMA aliases via pci_for_each_dma_alias() and programs a scalable-mode context entry for each RID. For a device with a dma_alias_mask, the callback is invoked once for the device’s own RID and once for each alias bit, all with the same pci_dev, so device_pasid_table_setup() runs for multiple RIDs. pci_for_each_dma_alias() stops at the first callback error. Therefore, a failure partway through the walk can leave context entries for already processed RIDs present and still pointing to the device’s PASID table. On this error path, intel_iommu_probe_device() currently jumps directly to intel_pasid_free_table(), which frees the PASID table without first tearing down those context entries. The IOMMU may then walk a present context entry whose PASID table pointer references freed memory. intel_iommu_re...