CVE-2025-38191 (GCVE-0-2025-38191)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2025-08-09 14:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in destroy_previous_session If client set ->PreviousSessionId on kerberos session setup stage, NULL pointer dereference error will happen. Since sess->user is not set yet, It can pass the user argument as NULL to destroy_previous_session. sess->user will be set in ksmbd_krb5_authenticate(). So this patch move calling destroy_previous_session() after ksmbd_krb5_authenticate().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/076f1adefb9837977af7ed233883842ddc446644
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0902625a24eea7fdc187faa5d97df244d159dd6e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1193486dffb7432a09f57f5d09049b4d4123538b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/281afc52e2961cd5dd8326ebc9c5bc40904c0468
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://www.zerodayinitiative.com/advisories/ZDI-25-610/
Impacted products
Vendor Product Version
Linux Linux Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
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   Linux Linux Version: 5.15
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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/smb/server/smb2pdu.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix null pointer dereference in destroy_previous_session\n\nIf client set -\u003ePreviousSessionId on kerberos session setup stage,\nNULL pointer dereference error will happen. Since sess-\u003euser is not\nset yet, It can pass the user argument as NULL to destroy_previous_session.\nsess-\u003euser will be set in ksmbd_krb5_authenticate(). So this patch move\ncalling destroy_previous_session() after ksmbd_krb5_authenticate()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-09T14:39:35.565Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/281afc52e2961cd5dd8326ebc9c5bc40904c0468"
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        {
          "url": "https://git.kernel.org/stable/c/0902625a24eea7fdc187faa5d97df244d159dd6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/1193486dffb7432a09f57f5d09049b4d4123538b"
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          "url": "https://git.kernel.org/stable/c/076f1adefb9837977af7ed233883842ddc446644"
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        },
        {
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-25-610/"
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      ],
      "title": "ksmbd: fix null pointer dereference in destroy_previous_session",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38191",
    "datePublished": "2025-07-04T13:37:15.736Z",
    "dateReserved": "2025-04-16T04:51:23.993Z",
    "dateUpdated": "2025-08-09T14:39:35.565Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38191\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-04T14:15:26.157\",\"lastModified\":\"2025-08-09T15:15:28.460\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: fix null pointer dereference in destroy_previous_session\\n\\nIf client set -\u003ePreviousSessionId on kerberos session setup stage,\\nNULL pointer dereference error will happen. Since sess-\u003euser is not\\nset yet, It can pass the user argument as NULL to destroy_previous_session.\\nsess-\u003euser will be set in ksmbd_krb5_authenticate(). So this patch move\\ncalling destroy_previous_session() after ksmbd_krb5_authenticate().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se corrige la desreferencia de puntero nulo en destroy_previous_session. Si el cliente configura -\u0026gt;PreviousSessionId durante la configuraci\u00f3n de la sesi\u00f3n Kerberos, se producir\u00e1 un error de desreferencia de puntero nulo. Dado que sess-\u0026gt;user a\u00fan no est\u00e1 configurado, se puede pasar el argumento de usuario como nulo a destroy_previous_session. Sess-\u0026gt;user se configurar\u00e1 en ksmbd_krb5_authenticate(). Por lo tanto, este parche modifica la llamada a destroy_previous_session() despu\u00e9s de ksmbd_krb5_authenticate().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/076f1adefb9837977af7ed233883842ddc446644\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0902625a24eea7fdc187faa5d97df244d159dd6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1193486dffb7432a09f57f5d09049b4d4123538b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/281afc52e2961cd5dd8326ebc9c5bc40904c0468\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-25-610/\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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