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CVE-2018-12896

Estado: ModificadaMedia (5.5)—

Se ha descubierto un problema en el kernel de Linux hasta la versión 4.17.3. Un desbordamiento de enteros en kernel/time/posix-timers.c en el código temporizador POSIX es causado por la forma en que funciona la contabilidad de desbordamiento. Dependiendo de los valores del intervalo y del tiempo de expiración, el desbordamiento puede ser mayor que INT_MAX, pero la contabilidad está basada en int. Esto básicamente hace que los valores contables, que son visibles para el espacio de usuario a través de timer_getoverrun(2) y siginfo::si_overrun, sean aleatorios. Por ejemplo, un usuario local puede causar una denegación de servicio (desbordamiento de enteros firmados) a través de llamadas al sistema mmap, futex, timer_create y timer_settime manipuladas.

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 (3)

Canonical — Ubuntu LinuxDebian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2018-12896",
  "cveTags": [],
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          "value": "CWE-190"
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      "value": "An issue was discovered in the Linux kernel through 4.17.3. An Integer Overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random. For example, a local user can cause a denial of service (signed integer overflow) via crafted mmap, futex, timer_create, and timer_settime system calls."
    },
    {
      "lang": "es",
      "value": "Se ha descubierto un problema en el kernel de Linux hasta la versión 4.17.3. Un desbordamiento de enteros en kernel/time/posix-timers.c en el código temporizador POSIX es causado por la forma en que funciona la contabilidad de desbordamiento. Dependiendo de los valores del intervalo y del tiempo de expiración, el desbordamiento puede ser mayor que INT_MAX, pero la contabilidad está basada en int. Esto básicamente hace que los valores contables, que son visibles para el espacio de usuario a través de timer_getoverrun(2) y siginfo::si_overrun, sean aleatorios. Por ejemplo, un usuario local puede causar una denegación de servicio (desbordamiento de enteros firmados) a través de llamadas al sistema mmap, futex, timer_create y timer_settime manipuladas."
    }
  ],
  "lastModified": "2026-06-17T01:38:32.173",
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