CVE-2025-38614
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
eventpoll: Fix semi-unbounded recursion
Ensure that epoll instances can never form a graph deeper than EP_MAX_NESTS+1 links.
Currently, ep_loop_check_proc() ensures that the graph is loop-free and does some recursion depth checks, but those recursion depth checks don't limit the depth of the resulting tree for two reasons:
Essentially, the current recursion depth check in ep_loop_check_proc() just serves to prevent it from recursing too deeply while checking for loops.
A more thorough check is done in reverse_path_check() after the new graph edge has already been created; this checks, among other things, that no paths going upwards from any non-epoll file with a length of more than 5 edges exist.
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However, this check does not apply to non-epoll files.
As a result, it is possible to recurse to a depth of at least roughly 500, tested on v6.15. (I am unsure if deeper recursion is possible; and this may have changed with commit 8c44dac8add7 ("eventpoll: Fix priority inversion problem").)
To fix it:
1. In ep_loop_check_proc(), note the subtree depth of each visited node, and use subtree depths for the total depth calculation even when a subtree has already been visited. 2. Add ep_get_upwards_depth_proc() for similarly determining the maximum depth of an upwards walk. 3. In ep_loop_check(), use these values to limit the total path length between epoll nodes to EP_MAX_NESTS edges.
Detalles técnicos trazas, registros y código del informe original
- They don't look upwards in the tree.
- If there are multiple downwards paths of different lengths, only one of
the paths is actually considered for the depth check since commit
28d82dc1c4ed ("epoll: limit paths").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: 0.18%
- Percentil entre todas las CVEs puntuadas: 7
- 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 (2)
CWE
- CWE-674
Referencias
- https://git.kernel.org/stable/c/1b13b033062824495554e836a1ff5f85ccf6b039
- https://git.kernel.org/stable/c/2a0c0c974bea9619c6f41794775ae4b97530e0e6
- https://git.kernel.org/stable/c/3542c90797bc3ab83ebab54b737d751cf3682036
- https://git.kernel.org/stable/c/71379495ab70eaba19224bd71b5b9b399eb85e04
- https://git.kernel.org/stable/c/7a2125962c42d5336ca0495a9ce4cb38a63e9161
- https://git.kernel.org/stable/c/ea5f97dbdcb1651581a22bd10afd2f0dd9dc11d6
- https://git.kernel.org/stable/c/f2e467a48287c868818085aa35389a224d226732
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventpoll: Fix semi-unbounded recursion\n\nEnsure that epoll instances can never form a graph deeper than\nEP_MAX_NESTS+1 links.\n\nCurrently, ep_loop_check_proc() ensures that the graph is loop-free and\ndoes some recursion depth checks, but those recursion depth checks don't\nlimit the depth of the resulting tree for two reasons:\n\n - They don't look upwards in the tree.\n - If there are multiple downwards paths of different lengths, only one of\n the paths is actually considered for the depth check since commit\n 28d82dc1c4ed (\"epoll: limit paths\").\n\nEssentially, the current recursion depth check in ep_loop_check_proc() just\nserves to prevent it from recursing too deeply while checking for loops.\n\nA more thorough check is done in reverse_path_check() after the new graph\nedge has already been created; this checks, among other things, that no\npaths going upwards from any non-epoll file with a length of more than 5\nedges exist. However, this check does not apply to non-epoll files.\n\nAs a result, it is possible to recurse to a depth of at least roughly 500,\ntested on v6.15. (I am unsure if deeper recursion is possible; and this may\nhave changed with commit 8c44dac8add7 (\"eventpoll: Fix priority inversion\nproblem\").)\n\nTo fix it:\n\n1. In ep_loop_check_proc(), note the subtree depth of each visited node,\nand use subtree depths for the total depth calculation even when a subtree\nhas already been visited.\n2. Add ep_get_upwards_depth_proc() for similarly determining the maximum\ndepth of an upwards walk.\n3. In ep_loop_check(), use these values to limit the total path length\nbetween epoll nodes to EP_MAX_NESTS edges."
},
{
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: eventpoll: Arregla recursión semi-ilimitada Garantiza que las instancias de epoll nunca puedan formar un grafo más profundo que los enlaces EP_MAX_NESTS+1. Actualmente, ep_loop_check_proc() garantiza que el grafo no tenga bucles y realiza algunas comprobaciones de profundidad de recursión, pero esas comprobaciones de profundidad de recursión no limitan la profundidad del árbol resultante por dos razones: - No miran hacia arriba en el árbol. - Si hay múltiples rutas descendentes de diferentes longitudes, solo una de las rutas se considera realmente para la comprobación de profundidad desde el commit 28d82dc1c4ed (\"epoll: limitar rutas\"). Esencialmente, la comprobación de profundidad de recursión actual en ep_loop_check_proc() solo sirve para evitar que recurra demasiado profundamente mientras comprueba bucles. Se realiza una comprobación más exhaustiva en reverse_path_check() después de que ya se haya creado el nuevo borde del grafo; Esto comprueba, entre otras cosas, que no existan rutas ascendentes desde ningún archivo que no sea epoll con una longitud de más de 5 aristas. Sin embargo, esta comprobación no se aplica a los archivos que no son epoll. Como resultado, es posible realizar una recursión a una profundidad de al menos aproximadamente 500, probada en la versión v6.15. (No estoy seguro de si es posible una recursión más profunda; esto puede haber cambiado con el commit 8c44dac8add7 (\"eventpoll: Corrección del problema de inversión de prioridad\")). Para solucionarlo: 1. En ep_loop_check_proc(), anote la profundidad del subárbol de cada nodo visitado y utilice las profundidades del subárbol para el cálculo de la profundidad total, incluso si ya se ha visitado un subárbol. 2. Añada ep_get_upwards_depth_proc() para determinar de forma similar la profundidad máxima de un recorrido ascendente. 3. En ep_loop_check(), utilice estos valores para limitar la longitud total de la ruta entre nodos epoll a EP_MAX_NESTS aristas. "
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"lastModified": "2026-07-30T06:23:30.720",
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