{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89632",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-89632"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "smb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr()",
  "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->ReparseDataLength 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->ReparseDataLength); /* offset 4, 2 bytes */\n\n    if (count < len || count < rdlen + len)      /* check comes after */\n\nstruct reparse_data_buffer has ReparseDataLength at offset 4.  If a\nserver returns OutputCount < 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 >= sizeof(*buf) before reading\nReparseDataLength, then verify count covers the data region.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
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        "1:6.6.51-1+rpt1",
        "1:6.6.51-1+rpt2",
        "1:6.6.51-1+rpt3",
        "1:6.6.62-1+rpt1",
        "1:6.6.74-1+rpt1"
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      "ecosystem_specific": {
        "binaries": [
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            "binary_version": "1:6.6.47-1+rpt1"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89632"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/711cf71300d7992f450600df8864917d3538679f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/05f78e6cf34ea3a285053bd5999e08e8ac298bd5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-13T06:49:25Z"
  }
}