CVE-2026-64280 (GCVE-0-2026-64280)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-23 12:45
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.
References
Impacted products
Vendor Product Version
Linux Linux Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
Version: fa8dda1edef9ebc3af467c644c5533ac97171e12
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/fpga/dfl-afu-main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            },
            {
              "lessThan": "d7e787eee2ea619b6dbb98890472ee73daf2e7fd",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            },
            {
              "lessThan": "a6a3884ff500f04f3088d6d09eec803cd35331a2",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            },
            {
              "lessThan": "16381bda90b261a656ded0568630c1b857b2ebc8",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            },
            {
              "lessThan": "b50e6cd2395cde615f59b624819998d28c0668d6",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            },
            {
              "lessThan": "59070040fd12e0b78d7b4d341d9f9a183237c5ff",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            },
            {
              "lessThan": "fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            },
            {
              "lessThan": "fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27",
              "status": "affected",
              "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/fpga/dfl-afu-main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.266",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.217",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.184",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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 \u003e\u003e 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:45:39.157Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7e787eee2ea619b6dbb98890472ee73daf2e7fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6a3884ff500f04f3088d6d09eec803cd35331a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/16381bda90b261a656ded0568630c1b857b2ebc8"
        },
        {
          "url": "https://git.kernel.org/stable/c/b50e6cd2395cde615f59b624819998d28c0668d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/59070040fd12e0b78d7b4d341d9f9a183237c5ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27"
        }
      ],
      "title": "fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64280",
    "datePublished": "2026-07-25T08:49:23.753Z",
    "dateReserved": "2026-07-19T15:36:31.777Z",
    "dateUpdated": "2026-08-23T12:45:39.157Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.