« Volver al listado

CVE-2026-61897

Estado: Pendiente de análisisAlta (7.8)—

An Ubuntu-specific patch to AccountsService before 23.13.9-8ubuntu7 only partially drops privileges before launching language helper scripts. It changes the effective UID/GID to the target user but leaves the real UID as 0 (root). A shell spawned by a helper script inherits ruid=0 and may reset its effective UID to root, enabling local privilege escalation.

CVSS

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local que permite escalada de privilegios mediante cambio incorrecto de UID real/efectivo en scripts helper, permitiendo restablecer privilegios de root (AV:L, PR:L, C:H/I:H/A:H).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

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

Canonical — AccountsserviceAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-61897",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-61897",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-26T19:43:37.600246Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@ubuntu.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@ubuntu.com",
      "affectedData": [
        {
          "vendor": "Canonical",
          "product": "accountsservice",
          "versions": [
            {
              "status": "affected",
              "version": "22.07.5-2ubuntu1",
              "lessThan": "22.07.5-2ubuntu1.6",
              "versionType": "dpkg"
            },
            {
              "status": "affected",
              "version": "23.13.9-2ubuntu6",
              "lessThan": "23.13.9-2ubuntu6.1",
              "versionType": "dpkg"
            },
            {
              "status": "affected",
              "version": "23.13.9-8ubuntu5",
              "lessThan": "23.13.9-8ubuntu5.2",
              "versionType": "dpkg"
            },
            {
              "status": "affected",
              "version": "23.13.9-8ubuntu6",
              "lessThan": "23.13.9-8ubuntu7",
              "versionType": "dpkg"
            }
          ],
          "platforms": [
            "Ubuntu 14.04 LTS",
            "Ubuntu 16.04 LTS",
            "Ubuntu 18.04 LTS",
            "Ubuntu 20.04 LTS",
            "Ubuntu 22.04 LTS",
            "Ubuntu 24.04 LTS",
            "Ubuntu 26.04 LTS",
            "Ubuntu 26.10"
          ],
          "packageName": "accountsservice",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-08-20T15:17:38.740",
  "references": [
    {
      "url": "https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/2157985",
      "source": "security@ubuntu.com"
    },
    {
      "url": "https://ubuntu.com/security/CVE-2026-61897",
      "source": "security@ubuntu.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@ubuntu.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-273"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Ubuntu-specific patch to AccountsService before 23.13.9-8ubuntu7 only partially drops privileges before launching language helper scripts. It changes the effective UID/GID to the target user but leaves the real UID as 0 (root). A shell spawned by a helper script inherits ruid=0 and may reset its effective UID to root, enabling local privilege escalation."
    }
  ],
  "lastModified": "2026-08-28T15:24:38.600",
  "sourceIdentifier": "security@ubuntu.com"
}