CVE-2026-23103
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ipvlan: Make the addrs_lock be per port Make the addrs_lock be per port, not per ipvlan dev. Initial code seems to be written in the assumption, that any address change must occur under RTNL. But it is not so for the case of IPv6. So 1) Introduce per-port addrs_lock. 2) It was needed to fix places where it was forgotten to take lock (ipvlan_open/ipvlan_close) This appears to be a very minor problem though. Since it's highly unlikely that ipvlan_add_addr() will be called on 2 CPU simultaneously. But nevertheless, this could cause: 1) False-negative of ipvlan_addr_busy(): one interface iterated through all port->ipvlans + ipvlan->addrs under some ipvlan spinlock, and another added IP under its own lock. Though this is only possible for IPv6, since looks like only ipvlan_addr6_event() can be called without rtnl_lock. 2) Race since ipvlan_ht_addr_add(port) is called under different ipvlan->addrs_lock locks This should not affect performance, since add/remove IP is a rare situation and spinlock is not taken on fast paths.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-02-04 17:16:21.177000
Last modified
2026-10-19 19:17:36.593000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-02-04T17:16:21.177",
"lastModified": "2026-10-19T19:17:36.593",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvlan: Make the addrs_lock be per port\n\nMake the addrs_lock be per port, not per ipvlan dev.\n\nInitial code seems to be written in the assumption,\nthat any address change must occur under RTNL.\nBut it is not so for the case of IPv6. So\n\n1) Introduce per-port addrs_lock.\n\n2) It was needed to fix places where it was forgotten\nto take lock (ipvlan_open/ipvlan_close)\n\nThis appears to be a very minor problem though.\nSince it's highly unlikely that ipvlan_add_addr() will\nbe called on 2 CPU simultaneously. But nevertheless,\nthis could cause:\n\n1) False-negative of ipvlan_addr_busy(): one interface\niterated through all port->ipvlans + ipvlan->addrs\nunder some ipvlan spinlock, and another added IP\nunder its own lock. Though this is only possible\nfor IPv6, since looks like only ipvlan_addr6_event() can be\ncalled without rtnl_lock.\n\n2) Race since ipvlan_ht_addr_add(port) is called under\ndifferent ipvlan->addrs_lock locks\n\nThis should not affect performance, since add/remove IP\nis a rare situation and spinlock is not taken on fast\npaths."
},
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"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipvlan: Hacer que el addrs_lock sea por puerto\n\nHacer que el addrs_lock sea por puerto, no por dispositivo ipvlan.\n\nEl código inicial parece estar escrito bajo la suposición de que cualquier cambio de dirección debe ocurrir bajo RTNL. Pero no es así para el caso de IPv6. Así que\n\n1) Introducir addrs_lock por puerto.\n\n2) Fue necesario corregir lugares donde se olvidó tomar el bloqueo (ipvlan_open/ipvlan_close)\n\nEsto parece ser un problema muy menor, sin embargo. Ya que es muy poco probable que ipvlan_add_addr() sea llamado en 2 CPU simultáneamente. Pero, sin embargo, esto podría causar:\n\n1) Falso negativo de ipvlan_addr_busy(): una interfaz iteró a través de todos los port->ipvlans + ipvlan->addrs bajo algún spinlock de ipvlan, y otra añadió IP bajo su propio bloqueo. Aunque esto solo es posible para IPv6, ya que parece que solo ipvlan_addr6_event() puede ser llamado sin rtnl_lock.\n\n2) Condición de carrera ya que ipvlan_ht_addr_add(port) es llamado bajo diferentes bloqueos ipvlan->addrs_lock.\n\nEsto no debería afectar el rendimiento, ya que añadir/eliminar IP es una situación rara y el spinlock no se toma en rutas rápidas."
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