{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a158bb66b1373866d9fd5997565a58a573085539"
            },
            {
              "fixed": "711cf71300d7992f450600df8864917d3538679f"
            },
            {
              "fixed": "05f78e6cf34ea3a285053bd5999e08e8ac298bd5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.6.32"
            },
            {
              "fixed": "7.2.4"
            },
            {
              "fixed": "7.3-rc1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89632.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr()\n\nreparse_buf_ptr() reads buf-\u003eReparseDataLength before checking that\ncount covers the full fixed header:\n\n    buf = (struct reparse_data_buffer *)((u8 *)io + off);\n    len = sizeof(*buf);                          /* 8 bytes */\n    rdlen = le16_to_cpu(buf-\u003eReparseDataLength); /* offset 4, 2 bytes */\n\n    if (count \u003c len || count \u003c rdlen + len)      /* check comes after */\n\nstruct reparse_data_buffer has ReparseDataLength at offset 4.  If a\nserver returns OutputCount \u003c 6, the read at offset 4-5 reaches past\nthe end of the received data.  The off+count bounds against iov_len\nwere already validated, but that does not protect against count being\nsmaller than sizeof(*buf).\n\nSplit the check: verify count \u003e= sizeof(*buf) before reading\nReparseDataLength, then verify count covers the data region.",
  "id": "CVE-2026-89632",
  "modified": "2026-09-15T03:30:53.621574982Z",
  "published": "2026-09-11T19:45:27.325Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/05f78e6cf34ea3a285053bd5999e08e8ac298bd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/711cf71300d7992f450600df8864917d3538679f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89632.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89632"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "smb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr()"
}