CVE-2026-23255
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: add proper RCU protection to /proc/net/ptype
Yin Fengwei reported an RCU stall in ptype_seq_show() and provided a patch.
Real issue is that ptype_seq_next() and ptype_seq_show() violate RCU rules.
ptype_seq_show() runs under rcu_read_lock(), and reads pt->dev to get device name without any barrier.
At the same time, concurrent writers can remove a packet_type structure (which is correctly freed after an RCU grace period) and clear pt->dev without an RCU grace period.
Define ptype_iter_state to carry a dev pointer along seq_net_private:
Leer descripción completaMostrar menos
We need to record the device pointer in ptype_get_idx() and ptype_seq_next() so that ptype_seq_show() is safe against concurrent pt->dev changes.
We also need to add full RCU protection in ptype_seq_next(). (Missing READ_ONCE() when reading list.next values)
Many thanks to Dong Chenchen for providing a repro.
Detalles técnicos trazas, registros y código del informe original
struct ptype_iter_state {
struct seq_net_private p;
struct net_device *dev; // added in this patch
};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: 0.11%
- Percentil entre todas las CVEs puntuadas: 1
- Fecha de la puntuación: 6/10/2026
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-noinfo
Referencias
- https://git.kernel.org/stable/c/002a73470b56848e4c81efeaaedd471e92d66d8d
- https://git.kernel.org/stable/c/589a530ae44d0c80f523fcfd1a15af8087f27d35
- https://git.kernel.org/stable/c/dcefd3f0b9ed8288654c75254bdcee8e1085e861
- https://git.kernel.org/stable/c/e974a10a52618f7f57a4bce173a0ed96acd4e5dc
- https://git.kernel.org/stable/c/f613e8b4afea0cd17c7168e8b00e25bc8d33175d
- 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\nnet: add proper RCU protection to /proc/net/ptype\n\nYin Fengwei reported an RCU stall in ptype_seq_show() and provided\na patch.\n\nReal issue is that ptype_seq_next() and ptype_seq_show() violate\nRCU rules.\n\nptype_seq_show() runs under rcu_read_lock(), and reads pt->dev\nto get device name without any barrier.\n\nAt the same time, concurrent writers can remove a packet_type structure\n(which is correctly freed after an RCU grace period) and clear pt->dev\nwithout an RCU grace period.\n\nDefine ptype_iter_state to carry a dev pointer along seq_net_private:\n\nstruct ptype_iter_state {\n\tstruct seq_net_private\tp;\n\tstruct net_device\t*dev; // added in this patch\n};\n\nWe need to record the device pointer in ptype_get_idx() and\nptype_seq_next() so that ptype_seq_show() is safe against\nconcurrent pt->dev changes.\n\nWe also need to add full RCU protection in ptype_seq_next().\n(Missing READ_ONCE() when reading list.next values)\n\nMany thanks to Dong Chenchen for providing a repro."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: añadir protección RCU adecuada a /proc/net/ptype\n\nYin Fengwei informó de un bloqueo RCU en ptype_seq_show() y proporcionó un parche.\n\nEl problema real es que ptype_seq_next() y ptype_seq_show() violan las reglas RCU.\n\nptype_seq_show() se ejecuta bajo rcu_read_lock(), y lee pt->dev para obtener el nombre del dispositivo sin ninguna barrera.\n\nAl mismo tiempo, los escritores concurrentes pueden eliminar una estructura packet_type (que se libera correctamente después de un período de gracia RCU) y borrar pt->dev sin un período de gracia RCU.\n\nDefinir ptype_iter_state para llevar un puntero dev junto con seq_net_private:\n\nstruct ptype_iter_state {\n\tstruct seq_net_private\tp;\n\tstruct net_device\t*dev; // añadido en este parche\n};\n\nNecesitamos registrar el puntero del dispositivo en ptype_get_idx() y ptype_seq_next() para que ptype_seq_show() esté a salvo de cambios concurrentes en pt->dev.\n\nTambién necesitamos añadir protección RCU completa en ptype_seq_next().\n(Falta READ_ONCE() al leer los valores de list.next)\n\nMuchas gracias a Dong Chenchen por proporcionar una reproducción."
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"lastModified": "2026-09-08T09:17:46.567",
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