{
  "cveId": "CVE-2026-53165",
  "url": "https://patchblox.com/security/cve/CVE-2026-53165",
  "summary": "CVE-2026-53165 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53165 (version 7.0.13-1), released June 28, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  iomap: avoid potential null folio-\u003Emapping deref...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  iomap: avoid potential null folio-\u003Emapping deref during error reporting  When a buffered read fails, iomap_finish_folio_read() reports the error with fserror_report_io(folio-\u003Emapping-\u003Ehost, ...). This is called after ifs-\u003Eread_bytes_pending has been decremented by the bytes attempted to be read.  For a folio split across multiple read completions, the folio is only guaranteed to stay locked while read_bytes_pending \u003E 0. Once iomap_finish_folio_read() decrements read_bytes_pending, another in-flight read can complete and end the read on the folio, which unlocks it. This allows truncate logic to run and detach the folio (set folio-\u003Emapping to NULL). The error reporting path then can dereference a NULL folio-\u003Emapping. As reported by Sam Sun, this is the race that can occur:  CPU0: failed completion      CPU1: final completion     CPU2: truncate -----------------------      ----------------------     -------------- read_bytes_pending -= len finished = false /* preempted before    fserror_report_io() */ \t\t\t     read_bytes_pending -= len \t\t\t     finished = true \t\t\t     folio_end_read() \t\t\t\t\t\t\ttruncate clears \t\t\t\t\t\t\tfolio-\u003Emapping fserror_report_io(   folio-\u003Emapping-\u003Ehost, ...) \t      ^ NULL deref  Fix this by reporting the error first before decrementing ifs-\u003Eread_bytes_pending.",
  "published": "2026-06-25T09:16:33Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00488,
  "epssPercentile": 0.42272,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.13-1",
      "fix": "DEBIAN-CVE-2026-53165",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53165",
      "released": "2026-06-28T17:47:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}