FKIE_CVE-2026-46243

Vulnerability from fkie_nvd - Published: 2026-06-01 17:17 - Updated: 2026-06-01 21:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/06/01/6
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/manizada/CIFSwitch
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-46243",
  "lastModified": "2026-06-01T21:16:46.090",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-06-01T17:17:34.173",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/01/6"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/manizada/CIFSwitch"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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