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CVE-2017-18509

Status: ModifiedHigh (7.8)—

An issue was discovered in net/ipv6/ip6mr.c in the Linux kernel before 4.11. By setting a specific socket option, an attacker can control a pointer in kernel land and cause an inet_csk_listen_stop general protection fault, or potentially execute arbitrary code under certain circumstances. The issue can be triggered as root (e.g., inside a default LXC container or with the CAP_NET_ADMIN capability) or after namespace unsharing. This occurs because sk_type and protocol are not checked in the appropriate part of the ip6_mroute_* functions. NOTE: this affects Linux distributions that use 4.9.x longterm kernels before 4.9.187.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (3)

Canonical — Ubuntu LinuxDebian — Debian LinuxLinux — Linux Kernel

CWEs

References

Raw JSON (NVD)

Show
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          "value": "CWE-20"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in net/ipv6/ip6mr.c in the Linux kernel before 4.11. By setting a specific socket option, an attacker can control a pointer in kernel land and cause an inet_csk_listen_stop general protection fault, or potentially execute arbitrary code under certain circumstances. The issue can be triggered as root (e.g., inside a default LXC container or with the CAP_NET_ADMIN capability) or after namespace unsharing. This occurs because sk_type and protocol are not checked in the appropriate part of the ip6_mroute_* functions. NOTE: this affects Linux distributions that use 4.9.x longterm kernels before 4.9.187."
    },
    {
      "lang": "es",
      "value": "Se detecto un problema en net / ipv6 / ip6mr.c en el kernel de Linux antes de 4.11. Al establecer una opción de socket específica, un atacante puede controlar un puntero en la tierra del kernel y causar una falla de protección general inet_csk_listen_stop, o potencialmente ejecutar código arbitrario bajo ciertas circunstancias. El problema se puede desencadenar como root (por ejemplo, dentro de un contenedor LXC predeterminado o con la capacidad CAP_NET_ADMIN) o después de compartir el espacio de nombres. Esto ocurre porque sk_type y el protocolo no se verifican en la parte apropiada de las funciones ip6_mroute_ *. NOTA: esto afecta a las distribuciones de Linux que usan núcleos a largo plazo 4.9.x anteriores a 4.9.187."
    }
  ],
  "lastModified": "2026-06-17T01:13:00.343",
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