In the Linux kernel, the following vulnerability has been resolved: iommu/riscv: prevent NULL deref in iovatophys The riscviommuptefetch() function returns either NULL for unmapped/never-mapped iova, or a valid leaf pte pointer that requires no further validation. riscviommuiovatophys() failed to handle NULL returns. Prevent null pointer dereference in riscviommuiovato_phys(), and remove the pte validation.