CVE-2026-48064

{
  "id": "CVE-2026-48064",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-27T20:16:40.230",
  "lastModified": "2026-10-26T11:10:00.157",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, when a PAM service is configured with deny_remote=false in pam_usb (commonly done for display managers such as gdm-password or lightdm to bypass process/TTY heuristics for local sessions), the PAM_RHOST check in pusb_do_auth() is also skipped. PAM_RHOST is set by remote daemons (sshd, XDMCP servers) to identify the remote client address. Because the check is gated inside if (opts.deny_remote), a genuine remote XDMCP connection reaches the USB device authentication step instead of being rejected. This vulnerability is fixed in 0.9.1."
    },
    {
      "lang": "es",
      "value": "pam_usb proporciona autenticación de hardware para Linux utilizando medios extraíbles ordinarios. Antes de la versión 0.9.1, cuando un servicio PAM está configurado con deny_remote=false en pam_usb (comúnmente hecho para gestores de pantalla como gdm-password o lightdm para omitir la heurística de proceso/TTY para sesiones locales), la verificación de PAM_RHOST en pusb_do_auth() también se omite. PAM_RHOST es establecido por demonios remotos (servidores sshd, XDMCP) para identificar la dirección del cliente remoto. Debido a que la verificación está protegida dentro de if (opts.deny_remote), una conexión XDMCP remota genuina alcanza el paso de autenticación del dispositivo USB en lugar de ser rechazada. Esta vulnerabilidad está corregida en la versión 0.9.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "mcdope",
          "product": "pam_usb",
          "versions": [
            {
              "version": "< 0.9.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-02T17:40:25.691792Z",
          "id": "CVE-2026-48064",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/mcdope/pam_usb/issues/348",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-w38v-cw9r-x9p6",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mcdope/pam_usb/issues/348",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}