{
  "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-2026-53165",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-53165",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-25T08:38:45.445Z",
    "updatedAt": "2026-08-05T12:33:38.251Z",
    "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": "iomap: avoid potential null folio->mapping deref during error reporting",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: avoid potential null folio->mapping deref during error reporting\n\nWhen a buffered read fails, iomap_finish_folio_read() reports the error\nwith fserror_report_io(folio->mapping->host, ...). This is called after\nifs->read_bytes_pending has been decremented by the bytes attempted to\nbe read.\n\nFor a folio split across multiple read completions, the folio is only\nguaranteed to stay locked while read_bytes_pending > 0. Once\niomap_finish_folio_read() decrements read_bytes_pending, another\nin-flight read can complete and end the read on the folio, which unlocks\nit. This allows truncate logic to run and detach the folio (set\nfolio->mapping to NULL). The error reporting path then can dereference a\nNULL folio->mapping. As reported by Sam Sun, this is the race that can\noccur:\n\nCPU0: failed completion      CPU1: final completion     CPU2: truncate\n-----------------------      ----------------------     --------------\nread_bytes_pending -= len\nfinished = false\n/* preempted before\n   fserror_report_io() */\n\t\t\t     read_bytes_pending -= len\n\t\t\t     finished = true\n\t\t\t     folio_end_read()\n\t\t\t\t\t\t\ttruncate clears\n\t\t\t\t\t\t\tfolio->mapping\nfserror_report_io(\n  folio->mapping->host, ...)\n\t      ^ NULL deref\n\nFix this by reporting the error first before decrementing\nifs->read_bytes_pending.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "a9d573ee88af980f14fdadb5c12bbf6a195fb3f1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1ad453817a4077230d1ba88eb0868f05f824449a"
            },
            {
              "version": "a9d573ee88af980f14fdadb5c12bbf6a195fb3f1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2eea7f44b9c8b42fd7d3a1a87c06a7cd1b99c327"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "7.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "7.0"
            },
            {
              "version": "7.0.13",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}