smb: Fix regression in writes when non-standard maximum write size negotiated

{
  "id": "7c69d199075c9847171fa96e9793274267937115441d1041b3093ad51abf22e7",
  "url": "https://osv.dev/vulnerability/CVE-2024-26692",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "smb: Fix regression in writes when non-standard maximum write size negotiated",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: smb: Fix regression in writes when non-standard maximum write size negotiated The conversion to netfs in the 6.3 kernel caused a regression when maximum write size is set by the server to an unexpected value which is not a multiple of 4096 (similarly if the user overrides the maximum write size by setting mount parm \"wsize\", but sets it to a value that is not a multiple of 4096). When negotiated write size is not a multiple of 4096 the netfs code can skip the end of the final page when doing large sequential writes, causing data corruption. This section of code is being rewritten/removed due to a large netfs change, but until that point (ie for the 6.3 kernel until now) we can not support non-standard maximum write sizes. Add a warning if a user specifies a wsize on mount that is not a multiple of 4096 (and round down), also add a change where we round down the maximum write size if the server negotiates a value that is not a multiple of 4096 (we also have to check to make sure that we do not round it down to zero).",
    "evidence": "osv:CVE-2024-26692",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.18",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.7.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-26692",
      "aliases": [
        "CVE-2024-26692"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "4145ccff546ea868428b3e0fe6818c6261b574a9"
                },
                {
                  "fixed": "63c35afd50e28b49c5b75542045a8c42b696dab9"
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                {
                  "fixed": "4860abb91f3d7fbaf8147d54782149bb1fc45892"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26692.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.6.18"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.7.6"
                }
              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26692.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.388663911Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4145ccff546ea868428b3e0fe6818c6261b574a9",
        "https://git.kernel.org/stable/c/4860abb91f3d7fbaf8147d54782149bb1fc45892",
        "https://git.kernel.org/stable/c/63c35afd50e28b49c5b75542045a8c42b696dab9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26692.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26692",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26692.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-26692",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517738,
  "published_at": "2024-04-03T14:54:53.343+00:00"
}