GHSA-3MG7-PFMQ-9QFV

Vulnerability from github – Published: 2026-06-01 18:31 – Updated: 2026-06-01 21:30
VLAI
Details

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

smb: client: reject userspace cifs.spnego descriptions

cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin.

Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-46243"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-01T17:17:34Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key.",
  "id": "GHSA-3mg7-pfmq-9qfv",
  "modified": "2026-06-01T21:30:41Z",
  "published": "2026-06-01T18:31:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46243"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/manizada/CIFSwitch"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/01/6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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