CVE-2026-90387

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

swiotlb: Preserve allocation virtual address for dynamic pools

swiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted

pool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the

atomic pool is backed by remapped virtual addresses, which are not the same

as the direct-map addresses returned by phys_to_virt().

swiotlb_init_io_tlb_pool() currently reconstructs the pool virtual address

from the physical start address. For atomic-pool backed allocations this

stores the wrong address in pool->vaddr. Later, swiotlb_free_tlb() passes

that address to dma_free_from_pool(), which will fail to recognize the

chunk

Pass the virtual address returned by the allocation path into

swiotlb_init_io_tlb_pool(), and store that address in pool->vaddr. This

keeps the pool free path using the same virtual address as the allocator.