CVE-2025-38614 (GCVE-0-2025-38614)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2026-05-12 12:05
VLAI?
Title
eventpoll: Fix semi-unbounded recursion
Summary
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: - 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"). 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. 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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e , < 71379495ab70eaba19224bd71b5b9b399eb85e04 (git)
Affected: 22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e , < 1b13b033062824495554e836a1ff5f85ccf6b039 (git)
Affected: 22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e , < 2a0c0c974bea9619c6f41794775ae4b97530e0e6 (git)
Affected: 22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e , < 7a2125962c42d5336ca0495a9ce4cb38a63e9161 (git)
Affected: 22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e , < ea5f97dbdcb1651581a22bd10afd2f0dd9dc11d6 (git)
Affected: 22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e , < 3542c90797bc3ab83ebab54b737d751cf3682036 (git)
Affected: 22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e , < f2e467a48287c868818085aa35389a224d226732 (git)
Affected: 8216e1a0d47cae06a75c42346f19dffe14e42d57 (git)
Affected: 28a92748aa4bc57d35e7b079498b0ac2e7610a37 (git)
Affected: 7eebcd4792c5a341559aed327b6afecbb1c46402 (git)
Affected: 0eccd188cfeaf857a26f2d72941d27d298cf6a54 (git)
Affected: a72affdbb09f3f24f64ffcbbdf62c2e57c58f379 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: eventpoll: Arregla recursi\u00f3n semi-ilimitada Garantiza que las instancias de epoll nunca puedan formar un grafo m\u00e1s 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 recursi\u00f3n, pero esas comprobaciones de profundidad de recursi\u00f3n no limitan la profundidad del \u00e1rbol resultante por dos razones: - No miran hacia arriba en el \u00e1rbol. - Si hay m\u00faltiples rutas descendentes de diferentes longitudes, solo una de las rutas se considera realmente para la comprobaci\u00f3n de profundidad desde el commit 28d82dc1c4ed (\\\"epoll: limitar rutas\\\"). Esencialmente, la comprobaci\u00f3n de profundidad de recursi\u00f3n actual en ep_loop_check_proc() solo sirve para evitar que recurra demasiado profundamente mientras comprueba bucles. Se realiza una comprobaci\u00f3n m\u00e1s exhaustiva en reverse_path_check() despu\u00e9s de que ya se haya creado el nuevo borde del grafo; Esto comprueba, entre otras cosas, que no existan rutas ascendentes desde ning\u00fan archivo que no sea epoll con una longitud de m\u00e1s de 5 aristas. Sin embargo, esta comprobaci\u00f3n no se aplica a los archivos que no son epoll. Como resultado, es posible realizar una recursi\u00f3n a una profundidad de al menos aproximadamente 500, probada en la versi\u00f3n v6.15. (No estoy seguro de si es posible una recursi\u00f3n m\u00e1s profunda; esto puede haber cambiado con el commit 8c44dac8add7 (\\\"eventpoll: Correcci\u00f3n del problema de inversi\u00f3n de prioridad\\\")). Para solucionarlo: 1. En ep_loop_check_proc(), anote la profundidad del sub\u00e1rbol de cada nodo visitado y utilice las profundidades del sub\u00e1rbol para el c\u00e1lculo de la profundidad total, incluso si ya se ha visitado un sub\u00e1rbol. 2. A\u00f1ada ep_get_upwards_depth_proc() para determinar de forma similar la profundidad m\u00e1xima 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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  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.