CVE-2025-38115
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net_sched: sch_sfq: fix a potential crash on gso_skb handling
SFQ has an assumption of always being able to queue at least one packet.
However, after the blamed commit, sch->q.len can be inflated by packets in sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed by an immediate drop.
Fix sfq_drop() to properly clear q->tail in this situation.
ip netns add lb ip link add dev to-lb type veth peer name in-lb netns lb ethtool -K to-lb tso off # force qdisc to requeue gso_skb ip netns exec lb ethtool -K in-lb gro on # enable NAPI ip link set dev to-lb up ip -netns lb link set dev in-lb up ip addr add dev to-lb 192.168.20.1/24 ip -netns lb addr add dev in-lb 192.168.20.2/24 tc qdisc replace dev to-lb root sfq limit 100
Leer descripción completaMostrar menos
ip netns exec lb netserver
netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 &
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: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- 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-401
Referencias
- https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72
- https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69
- https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832
- https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e
- https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085
- https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533
- https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc
- https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943
- 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: fix a potential crash on gso_skb handling\n\nSFQ has an assumption of always being able to queue at least one packet.\n\nHowever, after the blamed commit, sch->q.len can be inflated by packets\nin sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\n\nFix sfq_drop() to properly clear q->tail in this situation.\n\n\nip netns add lb\nip link add dev to-lb type veth peer name in-lb netns lb\nethtool -K to-lb tso off # force qdisc to requeue gso_skb\nip netns exec lb ethtool -K in-lb gro on # enable NAPI\nip link set dev to-lb up\nip -netns lb link set dev in-lb up\nip addr add dev to-lb 192.168.20.1/24\nip -netns lb addr add dev in-lb 192.168.20.2/24\ntc qdisc replace dev to-lb root sfq limit 100\n\nip netns exec lb netserver\n\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: sch_sfq: se corrige un posible fallo en la gestión de gso_skb. SFQ asume que siempre puede poner en cola al menos un paquete. Sin embargo, tras la confirmación responsable, sch->q.len puede inflarse con paquetes en sch->gso_skb, y una operación enqueue() en una qdisc SFQ vacía puede ir seguida de un descarte inmediato. Corrija sfq_drop() para que borre correctamente q->tail en esta situación. ip netns add lb ip link add dev to-lb type veth peer name in-lb netns lb ethtool -K to-lb tso off # force qdisc to requeue gso_skb ip netns exec lb ethtool -K in-lb gro on # enable NAPI ip link set dev to-lb up ip -netns lb link set dev in-lb up ip addr add dev to-lb 192.168.20.1/24 ip -netns lb addr add dev in-lb 192.168.20.2/24 tc qdisc replace dev to-lb root sfq limit 100 ip netns exec lb netserver netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & "
}
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"lastModified": "2026-07-30T06:22:52.100",
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