CVE-2025-38193
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net_sched: sch_sfq: reject invalid perturb period
Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch.
We want to make sure ctl->perturb_period * HZ will not overflow and is positive.
tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period.
tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period.
tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
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: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- 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-190
Referencias
- https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3
- https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5
- https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295
- https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8
- https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1
- https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441b
- https://git.kernel.org/stable/c/e0936ff56be4e08ad5b60ec26971eae0c40af305
- https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: reject invalid perturb period\n\nGerrard Tai reported that SFQ perturb_period has no range check yet,\nand this can be used to trigger a race condition fixed in a separate patch.\n\nWe want to make sure ctl->perturb_period * HZ will not overflow\nand is positive.\n\n\ntc qd add dev lo root sfq perturb -10 # negative value : error\nError: sch_sfq: invalid perturb period.\n\ntc qd add dev lo root sfq perturb 1000000000 # too big : error\nError: sch_sfq: invalid perturb period.\n\ntc qd add dev lo root sfq perturb 2000000 # acceptable value\ntc -s -d qd sh dev lo\nqdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec\n Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)\n backlog 0b 0p requeues 0"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: sch_sfq: rechaza un período de perturbación no válido. Gerrard Tai informó que SFQ perturb_period aún no tiene comprobación de rango, lo que puede usarse para activar una condición de ejecución corregida en un parche independiente. Queremos asegurarnos de que ctl->perturb_period * HZ no se desborde y sea positivo. tc qd add dev lo root sfq perturb -10 # valor negativo: error. Error: sch_sfq: período de perturbación no válido. tc qd add dev lo root sfq perturb 100000000 # demasiado grande: error. Error: sch_sfq: período de perturbación no válido. tc qd add dev lo root sfq perturb 2000000 # valor aceptable tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb Depth 127 flows 128 divisor 1024 perturb 2000000sec Enviados 0 bytes 0 paquete (eliminados 0, sobrepasa los límites 0, vuelve a poner en cola 0) backlog 0b 0p vuelve a poner en cola 0"
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"lastModified": "2026-07-30T06:22:59.313",
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