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CVE-2026-90169

Estado: RecibidaSin puntuar—

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

ksmbd: free preauth sessions on connection teardown

SMB3.1.1 multichannel binding preserves the preauthentication hash in a preauth_session between the NTLM negotiate and authenticate requests. The binding NTLM negotiate allocates this object and returns STATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends the authenticate request, neither the authenticate nor error cleanup paths free the object.

Release any remaining preauthentication sessions when tearing down the connection. Initialize the list when allocating the connection so that this cleanup is safe regardless of the negotiated dialect.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-90169",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "effcf48d79d8aa53113d8289e140746f25ceb62c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "b62b1ebb25f0a19067ed5b1a86036b2dc98be44f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "a41a98ee16ae038751b6639decadaa3ce15ca18a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "8e2ebc77678832e981adc008d25cd8f67d08ebc4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f5a544e3bab78142207e0242d22442db85ba1eff",
              "lessThan": "06c7b1d731bc105a8644f1b70165ba8b9416cbab",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/server/connection.c",
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/mgmt/user_session.h",
            "fs/smb/server/smb2ops.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/server/connection.c",
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/mgmt/user_session.h",
            "fs/smb/server/smb2ops.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:10.333",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/06c7b1d731bc105a8644f1b70165ba8b9416cbab",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8e2ebc77678832e981adc008d25cd8f67d08ebc4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a41a98ee16ae038751b6639decadaa3ce15ca18a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b62b1ebb25f0a19067ed5b1a86036b2dc98be44f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/effcf48d79d8aa53113d8289e140746f25ceb62c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: free preauth sessions on connection teardown\n\nSMB3.1.1 multichannel binding preserves the preauthentication hash in a\npreauth_session between the NTLM negotiate and authenticate requests.\nThe binding NTLM negotiate allocates this object and returns\nSTATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends\nthe authenticate request, neither the authenticate nor error cleanup paths\nfree the object.\n\nRelease any remaining preauthentication sessions when tearing down the\nconnection. Initialize the list when allocating the connection so that this\ncleanup is safe regardless of the negotiated dialect."
    }
  ],
  "lastModified": "2026-09-17T17:17:10.333",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}