CVE-2026-97565 (GCVE-0-2026-97565)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:21 – Updated: 2026-10-19 09:09
VLAI
Title
smb: client: reject short READ responses in CIFSSMBRead()
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject short READ responses in CIFSSMBRead() CIFSSMBRead() reads DataLengthHigh, DataLength and DataOffset out of the READ_RSP returned by the server without first checking that a whole READ_RSP was actually received. The length of the response is recorded in rsp_iov.iov_len, but nothing constrains it to be at least read_rsp_size before those fields are dereferenced. A malicious or compromised SMB1 server can return a response shorter than the READ_RSP header, so that parsing the header itself reads past the end of the receive buffer. SMB1 is not negotiated by default; reaching this code requires an explicit vers=1.0 mount. Reject the response unless it is at least read_rsp_size bytes long.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0f1f77b821506a4dacab6ce7d29cf9e0c26f14cd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aaa221c1b1d288845b55e9c366e5ef608dfff49d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e6142a8bfc230c7263eb8b0475249c958ce49367 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifssmb.c"
          ],
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject short READ responses in CIFSSMBRead()\n\nCIFSSMBRead() reads DataLengthHigh, DataLength and DataOffset out of\nthe READ_RSP returned by the server without first checking that a\nwhole READ_RSP was actually received. The length of the response is\nrecorded in rsp_iov.iov_len, but nothing constrains it to be at least\nread_rsp_size before those fields are dereferenced.\n\nA malicious or compromised SMB1 server can return a response shorter\nthan the READ_RSP header, so that parsing the header itself reads past\nthe end of the receive buffer. SMB1 is not negotiated by default;\nreaching this code requires an explicit vers=1.0 mount.\n\nReject the response unless it is at least read_rsp_size bytes long."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:09:28.115Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e6142a8bfc230c7263eb8b0475249c958ce49367"
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      "title": "smb: client: reject short READ responses in CIFSSMBRead()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97565",
    "datePublished": "2026-09-25T10:21:52.459Z",
    "dateReserved": "2026-09-24T16:01:01.155Z",
    "dateUpdated": "2026-10-19T09:09:28.115Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "id": "msrc_CVE-2026-97565",
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smb: client: reject short READ responses in CIFSSMBRead()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97565.json",
      "version": "2"
    },
    "nvd": {
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                "product": "Linux",
                "programFiles": [
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                ],
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject short READ responses in CIFSSMBRead()\n\nCIFSSMBRead() reads DataLengthHigh, DataLength and DataOffset out of\nthe READ_RSP returned by the server without first checking that a\nwhole READ_RSP was actually received. The length of the response is\nrecorded in rsp_iov.iov_len, but nothing constrains it to be at least\nread_rsp_size before those fields are dereferenced.\n\nA malicious or compromised SMB1 server can return a response shorter\nthan the READ_RSP header, so that parsing the header itself reads past\nthe end of the receive buffer. SMB1 is not negotiated by default;\nreaching this code requires an explicit vers=1.0 mount.\n\nReject the response unless it is at least read_rsp_size bytes long."
          }
        ],
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        "lastModified": "2026-10-19T10:17:25.610",
        "metrics": {},
        "published": "2026-09-25T11:17:07.127",
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  }
}



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