GHSA-R5F9-V87X-9739

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: run set info with opener credentials

SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials.

Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. This also removes the separate security information credential setup and keeps all SET_INFO classes under one credential scope.

Direct override_creds() is used because it can nest with the request credential overrides already used by rename and link helpers.

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-64393"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:22Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: run set info with opener credentials\n\nSMB2 SET_INFO handlers call path-based VFS helpers after checking the\naccess mask granted to the SMB handle. Those helpers perform their owner,\ninode permission and LSM checks using the current ksmbd worker credentials.\n\nRun the complete SET_INFO dispatch with the credentials captured when the\nhandle was opened. This also removes the separate security information\ncredential setup and keeps all SET_INFO classes under one credential scope.\n\nDirect override_creds() is used because it can nest with the request\ncredential overrides already used by rename and link helpers.",
  "id": "GHSA-r5f9-v87x-9739",
  "modified": "2026-07-27T06:30:36Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64393"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ce682867fd506f61f40c76bde7e4205bde34e87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20ee516a62989a8d505ee432f9e59525ea23984e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cbabf3a71575cd31bc7785d92d4ab42338a654b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cc9ec711f5255167247a9ab6a7179b787426ed7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b35afd5cf8fab236ef21117e42ee45691d4ffa7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b383bcad3d2fe634b26efbce53e22bbb5753a520"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.