CVE-2026-99114 (GCVE-0-2026-99114)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34
VLAI
Title
ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION smb2_get_info_filesystem() reports 48 bytes for FS_CONTROL_INFORMATION, that is the whole of struct smb2_fs_control_info, but never assigns FileSystemControlFlags. Those four bytes go to the client as they are found in the response buffer. The buffer is zeroed on allocation, so a standalone request leaks nothing. A compound request can leak: the offset of the next response is advanced by the length pinned for the previous one, so a reply that was written into the buffer and then dropped in favour of the short error response of smb2_set_err_rsp() stays there, and the next reply is laid over it with only the header cleared. ksmbd does not implement quota tracking, so report no control flags.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < d8c450ad0d08980b39b08d435efa921086c8b227 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 03bb4338c3a7c3fc4decf699a35753f0891aab2a (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < c0cd3fc6824122014da2b3b0cb7ddeaa2946ec8e (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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              "operator": "OR"
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      ],
      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION\n\nsmb2_get_info_filesystem() reports 48 bytes for FS_CONTROL_INFORMATION,\nthat is the whole of struct smb2_fs_control_info, but never assigns\nFileSystemControlFlags.  Those four bytes go to the client as they are\nfound in the response buffer.\n\nThe buffer is zeroed on allocation, so a standalone request leaks\nnothing.  A compound request can leak: the offset of the next response\nis advanced by the length pinned for the previous one, so a reply that\nwas written into the buffer and then dropped in favour of the short\nerror response of smb2_set_err_rsp() stays there, and the next reply is\nlaid over it with only the header cleared.\n\nksmbd does not implement quota tracking, so report no control flags."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:34:31.576Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-10-28T10:34:31.576Z",
    "dateReserved": "2026-09-25T10:25:14.392Z",
    "dateUpdated": "2026-10-28T10:34:31.576Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION\n\nsmb2_get_info_filesystem() reports 48 bytes for FS_CONTROL_INFORMATION,\nthat is the whole of struct smb2_fs_control_info, but never assigns\nFileSystemControlFlags.  Those four bytes go to the client as they are\nfound in the response buffer.\n\nThe buffer is zeroed on allocation, so a standalone request leaks\nnothing.  A compound request can leak: the offset of the next response\nis advanced by the length pinned for the previous one, so a reply that\nwas written into the buffer and then dropped in favour of the short\nerror response of smb2_set_err_rsp() stays there, and the next reply is\nlaid over it with only the header cleared.\n\nksmbd does not implement quota tracking, so report no control flags."
          }
        ],
        "id": "CVE-2026-99114",
        "lastModified": "2026-10-28T11:17:30.907",
        "metrics": {},
        "published": "2026-10-28T11:17:30.907",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99114.json",
      "version": "3"
    }
  }
}



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