{
  "cveId": "CVE-2026-89630",
  "url": "https://patchblox.com/security/cve/CVE-2026-89630",
  "summary": "CVE-2026-89630 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89630 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  smb: client: restore the data_offset bound in is...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  smb: client: restore the data_offset bound in is_valid_oplock_break()  Commit 83bfbd0bb902 (\u0022cifs: Remove the RFC1002 header from smb_hdr\u0022) changed the quantity this bound is measured against.  It used to be srv-\u003Etotal_read minus the 4-byte RFC1002 preamble that total_read then included, so it was the SMB message length.  The same commit stopped counting the preamble, and the mechanical substitution to srv-\u003Etotal_read - srv-\u003Epdu_size left an expression that is identically zero: standard_receive3() reads MID_HEADER_SIZE() bytes and then exactly pdu_length - MID_HEADER_SIZE() more, adding both to total_read.  len is therefore 0, the subtraction below it wraps, and no __u32 DataOffset can exceed the result, so the check from commit 097f5863b1a0 (\u0022cifs: read overflow in is_valid_oplock_break()\u0022) no longer rejects anything.  Use total_read, which is now the message length on its own.",
  "published": "2026-09-11T20:19:48Z",
  "severity": "critical",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00539,
  "epssPercentile": 0.45607,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89630",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89630",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}