CVE-2026-98686 (GCVE-0-2026-98686)
Vulnerability from cvelistv5
Published
2026-10-18 15:45
Modified
2026-10-30 12:38
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: discard post-EOF pagecache when extending a file via zero range smb3_zero_range() removed the pagecache only for the range being zeroed, so when it extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended. Lower the discard boundary to the smaller of the zero-range offset and the old EOF.
References
Impacted products
Vendor Product Version
Linux Linux Version: 72c419d9b073628d3b5b0b2fc787b724f1a8c726
Version: 72c419d9b073628d3b5b0b2fc787b724f1a8c726
Version: 72c419d9b073628d3b5b0b2fc787b724f1a8c726
Version: 72c419d9b073628d3b5b0b2fc787b724f1a8c726
Version: 72c419d9b073628d3b5b0b2fc787b724f1a8c726
Version: 72c419d9b073628d3b5b0b2fc787b724f1a8c726
Version: 72c419d9b073628d3b5b0b2fc787b724f1a8c726
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{
  "containers": {
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          "programFiles": [
            "fs/smb/client/smb2ops.c"
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              "version": "0",
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            },
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              "versionType": "original_commit_for_fix"
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          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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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\nsmb: client: discard post-EOF pagecache when extending a file via zero range\n\nsmb3_zero_range() removed the pagecache only for the range being zeroed,\nso when it extends the file the folio straddling the old EOF - which may\nhold data dirtied past EOF through an mmap - was never dropped and became\nvisible as file content once the file was extended.\n\nLower the discard boundary to the smaller of the zero-range offset and the\nold EOF."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:44.094Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1ecf89d8efca618e0c758c06b9a1fdde8bd941da"
        },
        {
          "url": "https://git.kernel.org/stable/c/03408d15c5405f8dc3e1a114cdce2174027a85f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/3df27277f8f95345d4a6c57367824bf1aefdbf66"
        },
        {
          "url": "https://git.kernel.org/stable/c/94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183"
        },
        {
          "url": "https://git.kernel.org/stable/c/b75dadb50a25eed525264bf6fea44fad94e7626f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d"
        },
        {
          "url": "https://git.kernel.org/stable/c/da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0"
        }
      ],
      "title": "smb: client: discard post-EOF pagecache when extending a file via zero range",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98686",
    "datePublished": "2026-10-18T15:45:55.193Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-30T12:38:44.094Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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