{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-17T04:50:25.703","vulnerabilities":[{"cve":{"id":"CVE-2025-38553","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2025-08-19T06:15:33.407","lastModified":"2026-01-08T20:49:12.590","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: Restrict conditions for adding duplicating netems to qdisc tree\n\nnetem_enqueue's duplication prevention logic breaks when a netem\nresides in a qdisc tree with other netems - this can lead to a\nsoft lockup and OOM loop in netem_dequeue, as seen in [1].\nEnsure that a duplicating netem cannot exist in a tree with other\nnetems.\n\nPrevious approaches suggested in discussions in chronological order:\n\n1) Track duplication status or ttl in the sk_buff struct. Considered\ntoo specific a use case to extend such a struct, though this would\nbe a resilient fix and address other previous and potential future\nDOS bugs like the one described in loopy fun [2].\n\n2) Restrict netem_enqueue recursion depth like in act_mirred with a\nper cpu variable. However, netem_dequeue can call enqueue on its\nchild, and the depth restriction could be bypassed if the child is a\nnetem.\n\n3) Use the same approach as in 2, but add metadata in netem_skb_cb\nto handle the netem_dequeue case and track a packet's involvement\nin duplication. This is an overly complex approach, and Jamal\nnotes that the skb cb can be overwritten to circumvent this\nsafeguard.\n\n4) Prevent the addition of a netem to a qdisc tree if its ancestral\npath contains a netem. However, filters and actions can cause a\npacket to change paths when re-enqueued to the root from netem\nduplication, leading us to the current solution: prevent a\nduplicating netem from inhabiting the same tree as other netems.\n\n[1] https://lore.kernel.org/netdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis_0G7VEk=@willsroot.io/\n[2] https://lwn.net/Articles/719297/"},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: Restringir las condiciones para agregar netems duplicados al árbol qdisc La lógica de prevención de duplicación de netem_enqueue se rompe cuando un netem reside en un árbol qdisc con otros netems: esto puede provocar un bloqueo suave y un bucle OOM en netem_dequeue, como se ve en [1]. Asegúrese de que un netem duplicado no pueda existir en un árbol con otros netems. Enfoques previos sugeridos en discusiones en orden cronológico: 1) Rastrear el estado de duplicación o ttl en la estructura sk_buff. Se considera un caso de uso demasiado específico para extender dicha estructura, aunque esta sería una solución resiliente y abordaría otros errores de DOS anteriores y futuros potenciales como el descrito en loopy fun [2]. 2) Restringir la profundidad de recursión de netem_enqueue como en act_mirred con una variable por CPU. Sin embargo, netem_dequeue puede ejecutar la función en cola en su elemento secundario, y la restricción de profundidad podría omitirse si el elemento secundario es un netem. 3) Use el mismo enfoque que en el punto 2, pero agregue metadatos en netem_skb_cb para gestionar el caso de netem_dequeue y rastrear la participación de un paquete en la duplicación. Este es un enfoque excesivamente complejo, y Jamal señala que el skb_cb puede sobrescribirse para eludir esta protección. 4) Evite la adición de un netem a un árbol qdisc si su ruta ancestral contiene un netem. Sin embargo, los filtros y las acciones pueden provocar que un paquete cambie de ruta al volver a encolarse a la raíz desde la duplicación de netem, lo que nos lleva a la solución actual: evitar que un netem duplicado ocupe el mismo árbol que otros netems. [1] https://lore.kernel.org/netdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis_0G7VEk=@willsroot.io/ [2] https://lwn.net/Articles/719297/"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-667"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.13","versionEndExcluding":"5.4.297","matchCriteriaId":"F9244D35-DE44-43CF-A62B-1D036E3477DD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.241","matchCriteriaId":"D0D21C35-EB8A-488A-BBF9-403E4817E5DD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.190","matchCriteriaId":"AD9E597F-3DDE-4D7E-976C-463D0611F13F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.148","matchCriteriaId":"3E5B1B93-C244-4B54-B3AB-12C2635A443B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.102","matchCriteriaId":"DD6EDB96-08AC-49D8-A1A9-4D2140C49BC7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.42","matchCriteriaId":"EA7AA5E6-4376-4A85-A021-6ACC5FF801C3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.15.10","matchCriteriaId":"5890C690-B295-40C2-9121-FF5F987E5142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.16.1","matchCriteriaId":"58182352-D7DF-4CC9-841E-03C1D852C3FB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*","matchCriteriaId":"6F62EECE-8FB1-4D57-85D8-CB9E23CF313C"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","matchCriteriaId":"FA6FEEC2-9F11-4643-8827-749718254FED"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/09317dfb681ac5a96fc69bea0c54441cf91b8270","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/103c4e27ec9f5fe53022e46e976abf52c7221baf","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/250f8796006c0f2bc638ce545f601d49ae8d528b","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/325f5ec67cc0a77f2d0d453445b9857f1cd06c76","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/795cb393e38977aa991e70a9363da0ee734b2114","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/ad340a4b4adb855b18b3666f26ad65c8968e2deb","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/cab2809944989889f88a1a8b5cff1c78460c72cb","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/ec8e0e3d7adef940cdf9475e2352c0680189d14e","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/f088b6ebe8797a3f948d2cae47f34bfb45cc6522","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Third Party Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Third Party Advisory"]}]}}]}