CVE-2025-71097
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ipv4: Fix reference count leak when using error routes with nexthop objects
When a nexthop object is deleted, it is marked as dead and then fib_table_flush() is called to flush all the routes that are using the dead nexthop.
The current logic in fib_table_flush() is to only flush error routes (e.g., blackhole) when it is called as part of network namespace dismantle (i.e., with flush_all=true). Therefore, error routes are not flushed when their nexthop object is deleted:
# ip link add name dummy1 up type dummy # ip nexthop add id 1 dev dummy1 # ip route add 198.51.100.1/32 nhid 1 # ip route add blackhole 198.51.100.2/32 nhid 1 # ip nexthop del id 1 # ip route show blackhole 198.51.100.2 nhid 1 dev dummy1
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As such, they keep holding a reference on the nexthop object which in turn holds a reference on the nexthop device, resulting in a reference count leak:
Fix by flushing error routes when their nexthop is marked as dead.
IPv6 does not suffer from this problem.
Detalles técnicos trazas, registros y código del informe original
# ip link del dev dummy1 [ 70.516258] unregister_netdevice: waiting for dummy1 to become free. Usage count = 2
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 3/10/2026
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 (1)
CWE
- NVD-CWE-Other
Referencias
- https://git.kernel.org/stable/c/30386e090c49e803c0616a7147e43409c32a2b0e
- https://git.kernel.org/stable/c/33ff5c207c873215e54e6176624ed57423cb7dea
- https://git.kernel.org/stable/c/5979338c83012110ccd45cae6517591770bfe536
- https://git.kernel.org/stable/c/5de7ad7e18356e39e8fbf7edd185a5faaf4f385a
- https://git.kernel.org/stable/c/ac782f4e3bfcde145b8a7f8af31d9422d94d172a
- https://git.kernel.org/stable/c/e3fc381320d04e4a74311e576a86cac49a16fc43
- https://git.kernel.org/stable/c/ee4183501ea556dca31f5ffd8690aa9fd25b609f
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: Fix reference count leak when using error routes with nexthop objects\n\nWhen a nexthop object is deleted, it is marked as dead and then\nfib_table_flush() is called to flush all the routes that are using the\ndead nexthop.\n\nThe current logic in fib_table_flush() is to only flush error routes\n(e.g., blackhole) when it is called as part of network namespace\ndismantle (i.e., with flush_all=true). Therefore, error routes are not\nflushed when their nexthop object is deleted:\n\n # ip link add name dummy1 up type dummy\n # ip nexthop add id 1 dev dummy1\n # ip route add 198.51.100.1/32 nhid 1\n # ip route add blackhole 198.51.100.2/32 nhid 1\n # ip nexthop del id 1\n # ip route show\n blackhole 198.51.100.2 nhid 1 dev dummy1\n\nAs such, they keep holding a reference on the nexthop object which in\nturn holds a reference on the nexthop device, resulting in a reference\ncount leak:\n\n # ip link del dev dummy1\n [ 70.516258] unregister_netdevice: waiting for dummy1 to become free. Usage count = 2\n\nFix by flushing error routes when their nexthop is marked as dead.\n\nIPv6 does not suffer from this problem."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipv4: Corrección de fuga de contador de referencias al usar rutas de error con objetos nexthop\n\nCuando un objeto nexthop es eliminado, es marcado como muerto y luego se llama a fib_table_flush() para vaciar todas las rutas que están usando el nexthop muerto.\n\nLa lógica actual en fib_table_flush() es vaciar solo las rutas de error (p. ej., blackhole) cuando se llama como parte del desmantelamiento de un espacio de nombres de red (es decir, con flush_all=true). Por lo tanto, las rutas de error no se vacían cuando su objeto nexthop es eliminado:\n\n # ip link add name dummy1 up type dummy\n # ip nexthop add id 1 dev dummy1\n # ip route add 198.51.100.1/32 nhid 1\n # ip route add blackhole 198.51.100.2/32 nhid 1\n # ip nexthop del id 1\n # ip route show\n blackhole 198.51.100.2 nhid 1 dev dummy1\n\nComo tal, siguen manteniendo una referencia en el objeto nexthop que a su vez mantiene una referencia en el dispositivo nexthop, lo que resulta en una fuga de contador de referencias:\n\n # ip link del dev dummy1\n [ 70.516258] unregister_netdevice: waiting for dummy1 to become free. Usage count = 2\n\nCorrección vaciando las rutas de error cuando su nexthop es marcado como muerto.\n\nIPv6 no sufre de este problema."
}
],
"lastModified": "2026-07-14T13:18:02.767",
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