CVE-2022-49958
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net/sched: fix netdevice reference leaks in attach_default_qdiscs()
In attach_default_qdiscs(), if a dev has multiple queues and queue 0 fails to attach qdisc because there is no memory in attach_one_default_qdisc(). Then dev->qdisc will be noop_qdisc by default. But the other queues may be able to successfully attach to default qdisc.
In this case, the fallback to noqueue process will be triggered. If the original attached qdisc is not released and a new one is directly attached, this will cause netdevice reference leaks.
The following is the bug log:
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Fix this bug by clearing any non-noop qdiscs that may have been assigned before trying to re-attach.
Detalles técnicos trazas, registros y código del informe original
veth0: default qdisc (fq_codel) fail, fallback to noqueue unregister_netdevice: waiting for veth0 to become free. Usage count = 32 leaked reference. qdisc_alloc+0x12e/0x210 qdisc_create_dflt+0x62/0x140 attach_one_default_qdisc.constprop.41+0x44/0x70 dev_activate+0x128/0x290 __dev_open+0x12a/0x190 __dev_change_flags+0x1a2/0x1f0 dev_change_flags+0x23/0x60 do_setlink+0x332/0x1150 __rtnl_newlink+0x52f/0x8e0 rtnl_newlink+0x43/0x70 rtnetlink_rcv_msg+0x140/0x3b0 netlink_rcv_skb+0x50/0x100 netlink_unicast+0x1bb/0x290 netlink_sendmsg+0x37c/0x4e0 sock_sendmsg+0x5f/0x70 ____sys_sendmsg+0x208/0x280
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: 0.25%
- Percentil entre todas las CVEs puntuadas: 14
- Fecha de la puntuación: 5/10/2026
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 (1)
CWE
- NVD-CWE-Other
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix netdevice reference leaks in attach_default_qdiscs()\n\nIn attach_default_qdiscs(), if a dev has multiple queues and queue 0 fails\nto attach qdisc because there is no memory in attach_one_default_qdisc().\nThen dev->qdisc will be noop_qdisc by default. But the other queues may be\nable to successfully attach to default qdisc.\n\nIn this case, the fallback to noqueue process will be triggered. If the\noriginal attached qdisc is not released and a new one is directly\nattached, this will cause netdevice reference leaks.\n\nThe following is the bug log:\n\nveth0: default qdisc (fq_codel) fail, fallback to noqueue\nunregister_netdevice: waiting for veth0 to become free. Usage count = 32\nleaked reference.\n qdisc_alloc+0x12e/0x210\n qdisc_create_dflt+0x62/0x140\n attach_one_default_qdisc.constprop.41+0x44/0x70\n dev_activate+0x128/0x290\n __dev_open+0x12a/0x190\n __dev_change_flags+0x1a2/0x1f0\n dev_change_flags+0x23/0x60\n do_setlink+0x332/0x1150\n __rtnl_newlink+0x52f/0x8e0\n rtnl_newlink+0x43/0x70\n rtnetlink_rcv_msg+0x140/0x3b0\n netlink_rcv_skb+0x50/0x100\n netlink_unicast+0x1bb/0x290\n netlink_sendmsg+0x37c/0x4e0\n sock_sendmsg+0x5f/0x70\n ____sys_sendmsg+0x208/0x280\n\nFix this bug by clearing any non-noop qdiscs that may have been assigned\nbefore trying to re-attach."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: corrige fugas de referencia de netdevice en attached_default_qdiscs() En attached_default_qdiscs(), si un dev tiene varias colas y la cola 0 no puede adjuntar qdisc porque no hay memoria en attached_one_default_qdisc(). Entonces dev->qdisc será noop_qdisc por defecto. Pero las otras colas pueden ser capaces de adjuntar con éxito a la qdisc predeterminada. En este caso, se activará el proceso de retorno a noqueue. Si la qdisc adjunta original no se libera y se adjunta una nueva directamente, esto causará fugas de referencia de netdevice. El siguiente es el registro de errores: veth0: falla de qdisc predeterminada (fq_codel), retorno a noqueue unregister_netdevice: esperando a que veth0 se libere. Recuento de uso = 32 referencias filtradas. qdisc_alloc+0x12e/0x210 qdisc_create_dflt+0x62/0x140 attach_one_default_qdisc.constprop.41+0x44/0x70 dev_activate+0x128/0x290 __dev_open+0x12a/0x190 __dev_change_flags+0x1a2/0x1f0 dev_change_flags+0x23/0x60 do_setlink+0x332/0x1150 __rtnl_newlink+0x52f/0x8e0 rtnl_newlink+0x43/0x70 rtnetlink_rcv_msg+0x140/0x3b0 netlink_rcv_skb+0x50/0x100 netlink_unicast+0x1bb/0x290 netlink_sendmsg+0x37c/0x4e0 sock_sendmsg+0x5f/0x70 ____sys_sendmsg+0x208/0x280 Corrija este error borrando cualquier qdisc que no sea noop que pueda haberse asignado antes de intentar volver a conectar."
}
],
"lastModified": "2026-06-17T05:19:37.450",
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