{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64280",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64280"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()\n\nafu_ioctl_dma_map() accepts a 64-bit length from userspace via\nDFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value\nis passed to afu_dma_pin_pages() where npages is derived as\nlength >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes\nint nr_pages, causing implicit truncation if length is very large.\n\nValidate map.length at the ioctl entry point before calling\nafu_dma_map_region(), rejecting values whose page count exceeds\nINT_MAX.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.184",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64280"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d7e787eee2ea619b6dbb98890472ee73daf2e7fd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a6a3884ff500f04f3088d6d09eec803cd35331a2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/16381bda90b261a656ded0568630c1b857b2ebc8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b50e6cd2395cde615f59b624819998d28c0668d6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/59070040fd12e0b78d7b4d341d9f9a183237c5ff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached locally through DFL_FPGA_PORT_DMA_MAP on a /dev/dfl-port.* character device.\nAC:L - A page-aligned length whose page count wraps to zero or a small positive integer deterministically triggers the mismatch; no race or condition outside the attacker\u2019s control is required.\nPR:L - The ioctl contains no capability or namespace privilege check, so any unprivileged user granted access to the port device can trigger it.\nUI:N - The attacker independently opens the device and submits the malicious ioctl without any victim action.\nS:C - The oversized DMA mapping can cross the IOMMU-enforced boundary between the assigned user buffer and host physical memory, affecting kernel and other-user resources.\nC:H - A small positive page-count wrap can create an enormous DMA-readable mapping after pinning only a few pages, exposing host memory beyond the authorized buffer; teardown also performs unbounded out-of-bounds pointer reads.\nI:H - The mapping is DMA_BIDIRECTIONAL, permitting writes beyond the pinned buffer, while the oversized unpin operation can corrupt unrelated page reference counts through out-of-bounds page pointers.\nA:H - A zero page-count wrap causes a deterministic pages[0] dereference from a zero-sized allocation, while other wrapped counts can produce an unbounded unpin traversal and kernel crash."
    }
  }
}