cve-2024-35839
Vulnerability from cvelistv5
Published
2024-05-17 14:27
Modified
2024-11-05 09:23
Severity ?
Summary
netfilter: bridge: replace physindev with physinif in nf_bridge_info
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/544add1f1cfb78c3dfa3e6edcf4668f6be5e730c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9325e3188a9cf3f69fc6f32af59844bbc5b90547
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9874808878d9eed407e3977fd11fee49de1e1d86
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2024-35839",
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                "timestamp": "2024-05-23T19:26:55.890240Z",
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netfilter_bridge.h",
            "include/linux/skbuff.h",
            "net/bridge/br_netfilter_hooks.c",
            "net/bridge/br_netfilter_ipv6.c",
            "net/ipv4/netfilter/nf_reject_ipv4.c",
            "net/ipv6/netfilter/nf_reject_ipv6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "programFiles": [
            "include/linux/netfilter_bridge.h",
            "include/linux/skbuff.h",
            "net/bridge/br_netfilter_hooks.c",
            "net/bridge/br_netfilter_ipv6.c",
            "net/ipv4/netfilter/nf_reject_ipv4.c",
            "net/ipv6/netfilter/nf_reject_ipv6.c"
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          "versions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: replace physindev with physinif in nf_bridge_info\n\nAn skb can be added to a neigh-\u003earp_queue while waiting for an arp\nreply. Where original skb\u0027s skb-\u003edev can be different to neigh\u0027s\nneigh-\u003edev. For instance in case of bridging dnated skb from one veth to\nanother, the skb would be added to a neigh-\u003earp_queue of the bridge.\n\nAs skb-\u003edev can be reset back to nf_bridge-\u003ephysindev and used, and as\nthere is no explicit mechanism that prevents this physindev from been\nfreed under us (for instance neigh_flush_dev doesn\u0027t cleanup skbs from\ndifferent device\u0027s neigh queue) we can crash on e.g. this stack:\n\narp_process\n  neigh_update\n    skb = __skb_dequeue(\u0026neigh-\u003earp_queue)\n      neigh_resolve_output(..., skb)\n        ...\n          br_nf_dev_xmit\n            br_nf_pre_routing_finish_bridge_slow\n              skb-\u003edev = nf_bridge-\u003ephysindev\n              br_handle_frame_finish\n\nLet\u0027s use plain ifindex instead of net_device link. To peek into the\noriginal net_device we will use dev_get_by_index_rcu(). Thus either we\nget device and are safe to use it or we don\u0027t get it and drop skb."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-05T09:23:24.208Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "netfilter: bridge: replace physindev with physinif in nf_bridge_info",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-35839",
    "datePublished": "2024-05-17T14:27:30.524Z",
    "dateReserved": "2024-05-17T13:50:33.104Z",
    "dateUpdated": "2024-11-05T09:23:24.208Z",
    "state": "PUBLISHED"
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  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-35839\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-17T15:15:21.017\",\"lastModified\":\"2024-05-17T18:35:35.070\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: bridge: replace physindev with physinif in nf_bridge_info\\n\\nAn skb can be added to a neigh-\u003earp_queue while waiting for an arp\\nreply. Where original skb\u0027s skb-\u003edev can be different to neigh\u0027s\\nneigh-\u003edev. For instance in case of bridging dnated skb from one veth to\\nanother, the skb would be added to a neigh-\u003earp_queue of the bridge.\\n\\nAs skb-\u003edev can be reset back to nf_bridge-\u003ephysindev and used, and as\\nthere is no explicit mechanism that prevents this physindev from been\\nfreed under us (for instance neigh_flush_dev doesn\u0027t cleanup skbs from\\ndifferent device\u0027s neigh queue) we can crash on e.g. this stack:\\n\\narp_process\\n  neigh_update\\n    skb = __skb_dequeue(\u0026neigh-\u003earp_queue)\\n      neigh_resolve_output(..., skb)\\n        ...\\n          br_nf_dev_xmit\\n            br_nf_pre_routing_finish_bridge_slow\\n              skb-\u003edev = nf_bridge-\u003ephysindev\\n              br_handle_frame_finish\\n\\nLet\u0027s use plain ifindex instead of net_device link. To peek into the\\noriginal net_device we will use dev_get_by_index_rcu(). Thus either we\\nget device and are safe to use it or we don\u0027t get it and drop skb.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: bridge: reemplace physindev con physinif en nf_bridge_info. Se puede agregar un skb a neigh-\u0026gt;arp_queue mientras se espera una respuesta de arp. Donde skb-\u0026gt;dev del skb original puede ser diferente al neigh-\u0026gt;dev de neigh. Por ejemplo, en el caso de unir un skb designado de un veth a otro, el skb se agregar\u00eda a un vecino-\u0026gt;arp_queue del puente. Como skb-\u0026gt;dev se puede restablecer a nf_bridge-\u0026gt;physindev y usarse, y como no existe un mecanismo expl\u00edcito que impida que este physindev se libere bajo nuestra responsabilidad (por ejemplo, neigh_flush_dev no limpia skbs de la cola vecina de diferentes dispositivos), podemos crashear, por ejemplo, en esta pila: arp_process neigh_update skb = __skb_dequeue(\u0026amp;neigh-\u0026gt;arp_queue) neigh_resolve_output(..., skb) ... br_nf_dev_xmit br_nf_pre_routing_finish_bridge_slow skb-\u0026gt;dev = nf_bridge-\u0026gt;physindev br_handle_frame_finish Usemos ifindex simple en lugar de enlace net_device. Para echar un vistazo al net_device original usaremos dev_get_by_index_rcu(). Por lo tanto, o obtenemos el dispositivo y podemos usarlo con seguridad o no lo obtenemos y eliminamos skb.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/544add1f1cfb78c3dfa3e6edcf4668f6be5e730c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9325e3188a9cf3f69fc6f32af59844bbc5b90547\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9874808878d9eed407e3977fd11fee49de1e1d86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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