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CVE-2018-16882

Estado: ModificadaAlta (8.8)—

Se ha detectado un uso de memoria previamente liberada en la manera en la que el hypervisor KVM del kernel de Linux procesa las interrupciones publicadas cuando la virtualización "nested(=1)" se encuentra habilitada. En caso de que se produzca un error durante el procesamiento de las direcciones de las interrupciones publicadas, nested_get_vmcs12_pages() desmapea "pi_desc_page" sin restablecer la dirección del descriptor "pi_desc", la cual se utiliza posteriormente en pi_test_and_clear_on(). Un usuario invitado/proceso podría aprovechar este fallo para forzar un cierre inesperado en el kernel del host, lo que resultaría en DoS o en el acceso privilegiado a un sistema. Las versiones del kernel anteriores a la 4.14.91 y la 4.19.13 son vulnerables.

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).

Tecnologías afectadas (2)

Canonical — Ubuntu LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2018-16882",
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      "value": "A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled. In nested_get_vmcs12_pages(), in case of an error while processing posted interrupt address, it unmaps the 'pi_desc_page' without resetting 'pi_desc' descriptor address, which is later used in pi_test_and_clear_on(). A guest user/process could use this flaw to crash the host kernel resulting in DoS or potentially gain privileged access to a system. Kernel versions before 4.14.91 and before 4.19.13 are vulnerable."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un uso de memoria previamente liberada en la manera en la que el hypervisor KVM del kernel de Linux procesa las interrupciones publicadas cuando la virtualización \"nested(=1)\" se encuentra habilitada. En caso de que se produzca un error durante el procesamiento de las direcciones de las interrupciones publicadas, nested_get_vmcs12_pages() desmapea \"pi_desc_page\" sin restablecer la dirección del descriptor \"pi_desc\", la cual se utiliza posteriormente en pi_test_and_clear_on(). Un usuario invitado/proceso podría aprovechar este fallo para forzar un cierre inesperado en el kernel del host, lo que resultaría en DoS o en el acceso privilegiado a un sistema. Las versiones del kernel anteriores a la 4.14.91 y la 4.19.13 son vulnerables."
    }
  ],
  "lastModified": "2026-06-17T01:44:59.207",
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