{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  smb: client: restore the data_offset bound in is_valid_oplock_break()  Commit 83bfbd0bb902 (\"cifs: Remove the RFC1002 header from smb_hdr\") 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 (\"cifs: read overflow in is_valid_oplock_break()\") no longer rejects anything.  Use total_read, which is now the message length on its own.",
  "id": "DEBIAN-CVE-2026-89630",
  "modified": "2026-09-14T08:47:42.482259314Z",
  "published": "2026-09-11T20:19:48.517Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89630"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-89630"
  ]
}