CVE-2026-90241

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_release_device() already performs teardown before freeing the

table. Apply the same ordering on the probe failure path.

device_pasid_table_teardown() safely handles RIDs that were never

programmed: iommu_context_addr() returns NULL when no context table has

been allocated, and clearing the Present bit of an already non-present

entry is a no-op. So unwind is safe for both the alias that failed and

any aliases not yet reached.