CVE-2026-97610 (GCVE-0-2026-97610)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-19 09:10
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix uninitialized return value in netfs_unbuffered_write() If preparation of the first subrequest fails, netfs_unbuffered_write() exits its loop before ret is initialized. The empty-iterator check can do the same. For synchronous writes, netfs_unbuffered_write_iter_locked() may then return an unrelated error instead of wreq->error. This is reachable through CIFS if cifs_prepare_write() fails to reopen the file or obtain credits. Initialize ret to 0 so the caller returns wreq->error if no data was written, or the number of bytes already written otherwise. Found with Clang's -Wconditional-uninitialized.
References
Impacted products
Vendor Product Version
Linux Linux Version: 72d08d2839649d1c5efbe375751f4473fa4486af
Version: a0b4c7a49137ed21279f354eb59f49ddae8dffc2
Version: a0b4c7a49137ed21279f354eb59f49ddae8dffc2
Version: 0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0
Version: 6.18.17   ≤
Version: 6.19.7   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/netfs/direct_write.c"
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          "vendor": "Linux",
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      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix uninitialized return value in netfs_unbuffered_write()\n\nIf preparation of the first subrequest fails,\nnetfs_unbuffered_write() exits its loop before ret is initialized. The\nempty-iterator check can do the same.\n\nFor synchronous writes, netfs_unbuffered_write_iter_locked() may then\nreturn an unrelated error instead of wreq-\u003eerror. This is reachable\nthrough CIFS if cifs_prepare_write() fails to reopen the file or obtain\ncredits.\n\nInitialize ret to 0 so the caller returns wreq-\u003eerror if no data was\nwritten, or the number of bytes already written otherwise.\n\nFound with Clang\u0027s -Wconditional-uninitialized."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:10:14.001Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e38d500471d097cda87d7d374bbc1b13493075d"
        },
        {
          "url": "https://git.kernel.org/stable/c/f18e8774f4d3137fa0a5fb8ffa83d59a719666d8"
        }
      ],
      "title": "netfs: Fix uninitialized return value in netfs_unbuffered_write()",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97610",
    "datePublished": "2026-09-25T10:22:20.228Z",
    "dateReserved": "2026-09-24T16:01:01.158Z",
    "dateUpdated": "2026-10-19T09:10:14.001Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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