CVE-2026-98681 (GCVE-0-2026-98681)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:45 – Updated: 2026-10-30 12:38
VLAI
Title
smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < f255e87b4f7eda568c37d6eae5db1d1a8aca5968 (git)
Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < 7fa619367869be705942f087b2ecd209efc78fe1 (git)
Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c (git)
Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < 3b8e7928cf1928555dc05d172dd02fb0e7692ec4 (git)
Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < 3786ee67658a2c80fef2544e7de2cd329e043cf9 (git)
Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < 4165641d06ef44f3a31b77a28048b6c737e885e7 (git)
Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < d9d23d115610e0342e768f6cb525d91c7b154027 (git)
Affected: 3bc303c254335dbd7c7012cc1760b12f1d5514d3 , < 19465a9aeb664f1d710d0d22c07c31bfb7c85446 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "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"
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          "url": "https://git.kernel.org/stable/c/7fa619367869be705942f087b2ecd209efc78fe1"
        },
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          "url": "https://git.kernel.org/stable/c/e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c"
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    "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"
  },
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      "date": "2026-11-02",
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      "id": "msrc_CVE-2026-98681",
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      "product_status:known_affected": "2",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98681.json",
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        "id": "CVE-2026-98681",
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        "metrics": {},
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T06:49:08+00:00",
      "cve": "CVE-2026-98681",
      "id": "CVE-2026-98681",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "91",
      "product_status:known_not_affected": "188",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98681.json",
      "version": "3"
    }
  }
}



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