CVE-2026-99273 (GCVE-0-2026-99273)

Vulnerability from cvelistv5 – Published: 2026-11-07 14:08 – Updated: 2026-11-10 18:15
VLAI
Title
ksmbd: reserve space for the UTF-16 terminator in stream info
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: reserve space for the UTF-16 terminator in stream info smb_strtoUTF16() always writes a terminating zero UTF-16 unit after the converted characters, but get_file_stream_info() budgets only sizeof(struct smb2_file_stream_info) + streamlen * 2 for a stream entry and sizeof(struct smb2_file_stream_info) + 7 * 2 for the trailing "::$DATA" entry. When an entry exactly fills the 448-byte small response buffer, the terminator is written two bytes past the allocation. Reserve one extra UTF-16 unit in both budget checks. The terminator is not part of the wire format, so the reported lengths are unchanged.
Severity
No CVSS data available.
Assigner
Linux CNA
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 583ede545a14f275a959772b5e1e50fe3e14b861 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 06a751809ebd33e95b05bf733697318a17a4872b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0e64f89563164719ceb1aa33f2a8bfd6391fa340 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a025c4991a7d83edc4dd339e3ea86d8ff6226eca (git)
Affected: 0 , < 6.12.117 (semver)
Affected: 0 , < 6.18.61 (semver)
Affected: 0 , < 7.3.2 (semver)
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Linux Linux Unaffected: 6.12.117 , ≤ 6.12.* (semver)
Unaffected: 6.18.61 , ≤ 6.18.* (semver)
Unaffected: 7.3.2 , ≤ 7.3.* (semver)
Unaffected: 7.4-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
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              "status": "unaffected",
              "version": "7.4-rc1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: reserve space for the UTF-16 terminator in stream info\n\nsmb_strtoUTF16() always writes a terminating zero UTF-16 unit after the\nconverted characters, but get_file_stream_info() budgets only\nsizeof(struct smb2_file_stream_info) + streamlen * 2 for a stream entry\nand sizeof(struct smb2_file_stream_info) + 7 * 2 for the trailing\n\"::$DATA\" entry. When an entry exactly fills the 448-byte small response\nbuffer, the terminator is written two bytes past the allocation.\n\nReserve one extra UTF-16 unit in both budget checks. The terminator is\nnot part of the wire format, so the reported lengths are unchanged."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T18:15:27.637Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/a025c4991a7d83edc4dd339e3ea86d8ff6226eca"
        }
      ],
      "title": "ksmbd: reserve space for the UTF-16 terminator in stream info",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99273",
    "datePublished": "2026-11-07T14:08:45.585Z",
    "dateReserved": "2026-09-25T10:25:14.405Z",
    "dateUpdated": "2026-11-10T18:15:27.637Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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