{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-53320",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-53320",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-26T19:41:11.932Z",
    "updatedAt": "2026-06-26T19:41:11.932Z",
    "importedAt": "2026-10-24T01:58:20.586Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()",
      "summary": "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]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e0a0c4903cbba351f0f5b5d104960d3a5b23202f"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9472d37799a0b9ff9b99639f35961ac2f0b3c9be"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "65e07964b4b2daf9a54e686cf0fa72d74a9648a8"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b88f905d4449b70da6bda547be546e365e44352e"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4525658002be3ad310b16bf8db48c8adb6a55d32"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e5ff0ba4b6983cdbcc826efc201e7179ece5d46f"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "94094e70fe292c9566502772d4d4d6d6a99204b1"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "be3e5d10643d3be1cbac9d9939f220a99253f980"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.30",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.30"
            },
            {
              "version": "5.10.258",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.209",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.175",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.141",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.91",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.33",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}