FKIE_CVE-2026-23103

Vulnerability from fkie_nvd - Published: 2026-02-04 17:16 - Updated: 2026-04-03 14:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04ba6de6eff61238e5397c14ac26a6578c7735a5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f300c10d92c547c3a7d978e1212ff52f18256edPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c149b662cbb202a450e81f938e702ba333864adPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a81e2db096913d7e43aada1c350c1282e76db39Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70feb16e3fbfb10b15de1396557c38e99f1ab8dfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/88f83e6c9cdb46b8c8ddd0ba01393362963cf589Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3ba32162488283c0a4c5bedd8817aec91748802Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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      "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\u0027s 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-\u003eipvlans + ipvlan-\u003eaddrs\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-\u003eaddrs_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 c\u00f3digo inicial parece estar escrito bajo la suposici\u00f3n de que cualquier cambio de direcci\u00f3n debe ocurrir bajo RTNL. Pero no es as\u00ed para el caso de IPv6. As\u00ed que\n\n1) Introducir addrs_lock por puerto.\n\n2) Fue necesario corregir lugares donde se olvid\u00f3 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 simult\u00e1neamente. Pero, sin embargo, esto podr\u00eda causar:\n\n1) Falso negativo de ipvlan_addr_busy(): una interfaz iter\u00f3 a trav\u00e9s de todos los port-\u0026gt;ipvlans + ipvlan-\u0026gt;addrs bajo alg\u00fan spinlock de ipvlan, y otra a\u00f1adi\u00f3 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) Condici\u00f3n de carrera ya que ipvlan_ht_addr_add(port) es llamado bajo diferentes bloqueos ipvlan-\u0026gt;addrs_lock.\n\nEsto no deber\u00eda afectar el rendimiento, ya que a\u00f1adir/eliminar IP es una situaci\u00f3n rara y el spinlock no se toma en rutas r\u00e1pidas."
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  "id": "CVE-2026-23103",
  "lastModified": "2026-04-03T14:16:23.400",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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