GHSA-CJMW-XWHW-8R5X

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

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

ksmbd: defer destroy_previous_session() until after NTLM authentication

In ntlm_authenticate(), destroy_previous_session() is called using a user pointer resolved from the client-supplied NTLM blob username field before the NTLMv2 response is validated. An authenticated attacker can set the NTLM blob username to match a victim account and set PreviousSessionId to the victim's session ID; destroy_previous_session() destroys the victim's session while ksmbd_decode_ntlmssp_auth_blob() subsequently rejects the request with -EPERM.

Move destroy_previous_session() and the prev_id assignment to after ksmbd_decode_ntlmssp_auth_blob() returns success and use sess->user rather than the pre-authentication lookup result. This matches the ordering already used by krb5_authenticate(), where destroy_previous_session() is called only after ksmbd_krb5_authenticate() returns success.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68130"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:19:58Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: defer destroy_previous_session() until after NTLM authentication\n\nIn ntlm_authenticate(), destroy_previous_session() is called using a\nuser pointer resolved from the client-supplied NTLM blob username field\nbefore the NTLMv2 response is validated. An authenticated attacker can\nset the NTLM blob username to match a victim account and set\nPreviousSessionId to the victim\u0027s session ID; destroy_previous_session()\ndestroys the victim\u0027s session while ksmbd_decode_ntlmssp_auth_blob()\nsubsequently rejects the request with -EPERM.\n\nMove destroy_previous_session() and the prev_id assignment to after\nksmbd_decode_ntlmssp_auth_blob() returns success and use sess-\u003euser\nrather than the pre-authentication lookup result. This matches the\nordering already used by krb5_authenticate(), where\ndestroy_previous_session() is called only after\nksmbd_krb5_authenticate() returns success.",
  "id": "GHSA-cjmw-xwhw-8r5x",
  "modified": "2026-08-19T18:32:06Z",
  "published": "2026-08-10T15:33:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68130"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ff12308c8a6c16ab68f0a487ffa93d69001dc18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18705cace0619fd2123737dcd028147774f38181"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/243f1614ef2aca2d62a744575f1c24b07cd42757"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/370b0ec8822b69c9073265e16b7daaa8201c9a4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c833074b549e5db125436a6f681af682261f785"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c74801ee524f477c174a1899782b6c3b6918d407"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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