{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7942b919f7321f95a777d396ff7894a7a83dc9b0"
            },
            {
              "fixed": "e0a0c4903cbba351f0f5b5d104960d3a5b23202f"
            },
            {
              "fixed": "9472d37799a0b9ff9b99639f35961ac2f0b3c9be"
            },
            {
              "fixed": "65e07964b4b2daf9a54e686cf0fa72d74a9648a8"
            },
            {
              "fixed": "b88f905d4449b70da6bda547be546e365e44352e"
            },
            {
              "fixed": "4525658002be3ad310b16bf8db48c8adb6a55d32"
            },
            {
              "fixed": "e5ff0ba4b6983cdbcc826efc201e7179ece5d46f"
            },
            {
              "fixed": "94094e70fe292c9566502772d4d4d6d6a99204b1"
            },
            {
              "fixed": "be3e5d10643d3be1cbac9d9939f220a99253f980"
            }
          ],
          "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": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.141"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.91"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.33"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53320.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()\n\nnilfs_ioctl_mark_blocks_dirty() uses bd_oblocknr to detect dead blocks\nby comparing it with the current block number bd_blocknr. If they differ,\nthe block is considered dead and skipped.\n\nHowever, bd_oblocknr should never be 0 since block 0 typically stores the\nprimary superblock and is never a valid GC target block. A corrupted ioctl\nrequest with bd_oblocknr set to 0 causes the comparison to incorrectly\nmatch when the lookup returns -ENOENT and sets bd_blocknr to 0, bypassing\nthe dead block check and calling nilfs_bmap_mark() on a non-existent\nblock. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering\nthe WARN_ON(ret == -ENOENT).\n\nFix this by rejecting ioctl requests with bd_oblocknr set to 0 at the\nbeginning of each iteration.\n\n[ryusuke: slightly modified the commit message and comments for accuracy]",
  "id": "CVE-2026-53320",
  "modified": "2026-07-08T05:39:00.188112970Z",
  "published": "2026-06-26T19:41:11.932Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4525658002be3ad310b16bf8db48c8adb6a55d32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65e07964b4b2daf9a54e686cf0fa72d74a9648a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94094e70fe292c9566502772d4d4d6d6a99204b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9472d37799a0b9ff9b99639f35961ac2f0b3c9be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b88f905d4449b70da6bda547be546e365e44352e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be3e5d10643d3be1cbac9d9939f220a99253f980"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e0a0c4903cbba351f0f5b5d104960d3a5b23202f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5ff0ba4b6983cdbcc826efc201e7179ece5d46f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53320.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53320"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()"
}