UBUNTU-CVE-2026-90241: High severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Tear down scalable-mode context on probe failure intelpasidsetupsmcontext() walks a PCI device’s DMA aliases via pciforeachdmaalias() and programs a scalable-mode context entry for each RID. For a device with a dmaaliasmask, the callback is invoked once for the device’s own RID and once for each alias bit, all with the same pcidev, so devicepasidtablesetup() runs for multiple RIDs. pciforeachdmaalias() 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, inteliommuprobedevice() currently jumps directly to intelpasidfreetable(), 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. inteliommureleasedevice() already performs teardown before freeing the table. Apply the same ordering on the probe failure path. devicepasidtableteardown() safely handles RIDs that were never programmed: iommucontextaddr() 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.