{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90387",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90387"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "swiotlb: Preserve allocation virtual address for dynamic pools",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nswiotlb: Preserve allocation virtual address for dynamic pools\n\nswiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted\npool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the\natomic pool is backed by remapped virtual addresses, which are not the same\nas the direct-map addresses returned by phys_to_virt().\n\nswiotlb_init_io_tlb_pool() currently reconstructs the pool virtual address\nfrom the physical start address. For atomic-pool backed allocations this\nstores the wrong address in pool->vaddr. Later, swiotlb_free_tlb() passes\nthat address to dma_free_from_pool(), which will fail to recognize the\nchunk\n\nPass the virtual address returned by the allocation path into\nswiotlb_init_io_tlb_pool(), and store that address in pool->vaddr. This\nkeeps the pool free path using the same virtual address as the allocator.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90387"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/68bf3ebd8e7020dae58e8aa14c7d482738bff9a8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45507dcb0847e96add4455274b12df0eca6590b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/35e0103177826430b5df888b1506239d41e76ab5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c1f4d7763cdf1b9e0d35c14aa6f52d0512a36319"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/57d29044d0f29a76c6ec0c112c8c7371d5608dc7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The mismatch is kernel-internal: swiotlb_init_io_tlb_pool() stored phys_to_virt(start) instead of the remapped cpu_addr from dma_alloc_from_pool(), not bytes from a protocol message. Local I/O reaches it via dma_map_page_attrs() \u2192 dma_direct_map_phys() \u2192 swiotlb_map() \u2192 swiotlb_tbl_map_single() \u2192 swiotlb_find_slots() GFP_NOWAIT transient allocation.\nAC:L - On an ARM64 realm guest force_dma_unencrypted() is true, so every GFP_NOWAIT swiotlb_alloc_tlb() in swiotlb_find_slots() uses dma_alloc_from_pool() and CONFIG_DMA_DIRECT_REMAP makes that vaddr differ from phys_to_virt(); filling io_tlb_default_mem then unmapping is attacker-driven I/O with no race.\nPR:L - No capability check gates dma_map_page_attrs() or swiotlb_tbl_map_single(). An unprivileged user triggers the GFP_NOWAIT transient pool by ordinary I/O, e.g. virtio-blk virtqueue_add_sgs() \u2192 virtqueue_map_page_attrs(), or sendmsg on virtio-net, which bounce through SWIOTLB_FORCE on a CCA guest.\nUI:N - The attacker\u2019s own map/unmap I/O allocates the transient pool and later dma_direct_unmap_phys() \u2192 __swiotlb_tbl_unmap_single() \u2192 swiotlb_del_transient() \u2192 swiotlb_dyn_free() \u2192 swiotlb_free_tlb(); no victim mount or other action is required.\nS:U - pool->start remains page_to_phys(tlb), so the device still DMAs to the allocated bounce pages. The defect is swiotlb_free_tlb() passing the linear phys_to_virt address into dma_free_from_pool()/__free_pages, corrupting the guest page allocator, not an IOMMU map of foreign pages or a realm/host escape.\nC:H - When dma_free_from_pool() rejects the linear address, swiotlb_free_tlb() still __free_pages()s those atomic-pool frames while gen_pool still owns them and dma_common_contiguous_remap() leaves a decrypted VM_DMA_COHERENT alias, so the pages can be reallocated with a stale kernel mapping.\nI:H - atomic_pool_expand() allocated one high-order compound page that gen_pool carved up; __free_pages(virt_to_page(linear_vaddr), get_order(tlb_size)) is a wrong-order or tail-page free of that block, corrupting buddy metadata and yielding an arbitrary write primitive.\nA:H - The same __free_pages() of a compound tail page or the wrong order produces bad-page handling, VM_BUG, or an oops, and any leftover coherent remap or reused frame later panics when touched."
    }
  }
}