{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7942b919f7321f95a777d396ff7894a7a83dc9b0"
            },
            {
              "fixed": "898404cdf882d7b54f1132f75570984ca3214796"
            },
            {
              "fixed": "ba8a8b563a28d358c45c62a306d421434a058648"
            },
            {
              "fixed": "3bd064ccc70b85f9a3d53aece29dc8473be5a226"
            },
            {
              "fixed": "a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1"
            },
            {
              "fixed": "68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44"
            },
            {
              "fixed": "e447f7edb99bd00cec63d6f3049e2e5074946f71"
            },
            {
              "fixed": "ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1"
            },
            {
              "fixed": "fbcfb75c20d71a5b542ad4ac3b79d10b997c8152"
            },
            {
              "fixed": "a1735eae55448bc79c2da6593455791e886f6ed8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.30"
            },
            {
              "fixed": "5.10.269"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.220"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.187"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.156"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.108"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80807.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject invalid block index in GC ioctl\n\nSyzbot reported list corruption caused by a double list_add_tail() call on\nbh-\u003eb_assoc_buffers within nilfs_lookup_dirty_data_buffers().\n\nAnalysis revealed that the root cause was the insertion of a page/folio\nwith a page index of ULONG_MAX into the page cache via the GC ioctl.\nfilemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(),\nrepeatedly detects a dirty folio with a page index of ULONG_MAX due to\nindex wrap-around, leading to duplicate processing of dirty buffers.\n\nAs a preparatory step, the GC ioctl loads the page/folio of the block to\nbe moved during GC and inserts it into the page cache based on information\nin the nilfs_vdesc structure passed as an argument.  Normally, this does\nnot cause issues because the user-space GC library configures the\nnilfs_vdesc structure properly.  However, since there is no range check on\nthe parameters determining the page index, a request with artificially\ncrafted parameters -- such as those generated by Syzbot -- can result in a\npage/folio being inserted with a page index of ULONG_MAX, triggering the\nabove problem.\n\nThis resolves the issue by checking the ranges of 'vd_offset' and\n'vd_vblocknr' in the nilfs_vdesc structure that determine the page index,\nthereby preventing the invalid page/folio insertions.",
  "id": "CVE-2026-80807",
  "modified": "2026-09-06T03:30:44.527491344Z",
  "published": "2026-09-04T15:13:23.605Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bd064ccc70b85f9a3d53aece29dc8473be5a226"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/898404cdf882d7b54f1132f75570984ca3214796"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80807.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80807"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nilfs2: reject invalid block index in GC ioctl"
}