CVE-2026-98681 (GCVE-0-2026-98681)
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: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
Version: 3bc303c254335dbd7c7012cc1760b12f1d5514d3
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifsglob.h"
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              "version": "0",
              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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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: split cifsFileInfo bitfields to avoid shared-byte RMW races\n\nThe invalidHandle, swapfile, oplock_break_cancelled, offload,\nand status_file_deleted fields are stored in the same bitfield byte\nin struct cifsFileInfo, but are updated in different code paths that\nmay run simultaneously, and are protected by different locks.  Since\nbitfield assignments generate byte-level read-modify-write operations,\na modification to one flag can overwrite a concurrent modification to\nanother flag.\n\nTo avoid these races, convert these flags from a bitfield to\nseparate bool fields."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:43.025Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f255e87b4f7eda568c37d6eae5db1d1a8aca5968"
        },
        {
          "url": "https://git.kernel.org/stable/c/7fa619367869be705942f087b2ecd209efc78fe1"
        },
        {
          "url": "https://git.kernel.org/stable/c/e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b8e7928cf1928555dc05d172dd02fb0e7692ec4"
        },
        {
          "url": "https://git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9"
        },
        {
          "url": "https://git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027"
        },
        {
          "url": "https://git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446"
        }
      ],
      "title": "smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98681",
    "datePublished": "2026-10-18T15:45:45.654Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-30T12:38:43.025Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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