CVE-2026-48984

{
  "id": "CVE-2026-48984",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-18T18:16:19.493",
  "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. In versions 0.9.1 and below, the xfree() memory release helper in calls free() without first zeroing the buffer contents, releasing heap-allocated buffers containing sensitive data — including one-time pad bytes read from disk — without clearing, leaving the sensitive content in freed heap memory until it happens to be overwritten by a subsequent allocation. On a system where a use-after-free condition exists, or where a heap inspection primitive becomes available, this could allow recovery of pad values or other authentication material from freed memory regions. This is a defence-in-depth requirement consistent with prior hardening work in this codebase (GHSA-vx6f-rrqr-j87c applied explicit_bzero to some pad paths; this issue generalises the pattern to the central deallocation helper)."
    },
    {
      "lang": "es",
      "value": "pam_usb proporciona autenticación de hardware para Linux utilizando medios extraíbles ordinarios. En las versiones 0.9.1 e inferiores, el asistente de liberación de memoria xfree() llama a free() sin primero poner a cero el contenido del búfer, liberando búferes asignados en el heap que contienen datos sensibles - incluyendo bytes de ’one-time pad’ leídos del disco - sin limpiar, dejando el contenido sensible en la memoria del heap liberada hasta que sea sobrescrito por una asignación posterior. En un sistema donde existe una condición de uso después de liberación, o donde un primitivo de inspección del heap esté disponible, esto podría permitir la recuperación de valores de ’pad’ u otro material de autenticación de regiones de memoria liberadas. Este es un requisito de defensa en profundidad consistente con el trabajo de endurecimiento previo en esta base de código (GHSA-vx6f-rrqr-j87c aplicó explicit_bzero a algunas rutas de ’pad’; este problema generaliza el patrón al asistente de desasignación central)."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "mcdope",
          "product": "pam_usb",
          "versions": [
            {
              "version": "< 0.9.2",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-18T18:47:42.610995Z",
          "id": "CVE-2026-48984",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-14"
        },
        {
          "lang": "en",
          "value": "CWE-226"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/mcdope/pam_usb/releases/tag/0.9.2",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-rmp6-wfrq-wrrc",
      "source": "[email protected]"
    }
  ]
}