FKIE_CVE-2026-98681

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-30 13:21
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3b8e7928cf1928555dc05d172dd02fb0e7692ec4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7fa619367869be705942f087b2ecd209efc78fe1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f255e87b4f7eda568c37d6eae5db1d1a8aca5968
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifsglob.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f255e87b4f7eda568c37d6eae5db1d1a8aca5968",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            },
            {
              "lessThan": "7fa619367869be705942f087b2ecd209efc78fe1",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            },
            {
              "lessThan": "e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            },
            {
              "lessThan": "3b8e7928cf1928555dc05d172dd02fb0e7692ec4",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            },
            {
              "lessThan": "3786ee67658a2c80fef2544e7de2cd329e043cf9",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            },
            {
              "lessThan": "4165641d06ef44f3a31b77a28048b6c737e885e7",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            },
            {
              "lessThan": "d9d23d115610e0342e768f6cb525d91c7b154027",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            },
            {
              "lessThan": "19465a9aeb664f1d710d0d22c07c31bfb7c85446",
              "status": "affected",
              "version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifsglob.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.32"
            },
            {
              "lessThan": "2.6.32",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-98681",
  "lastModified": "2026-10-30T13:21:17.970",
  "metrics": {},
  "published": "2026-10-18T16:17:21.457",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b8e7928cf1928555dc05d172dd02fb0e7692ec4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7fa619367869be705942f087b2ecd209efc78fe1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f255e87b4f7eda568c37d6eae5db1d1a8aca5968"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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