CVE-2024-35839 (GCVE-0-2024-35839)
Vulnerability from cvelistv5
Published
2024-05-17 14:27
Modified
2025-05-04 09:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: replace physindev with physinif in nf_bridge_info An skb can be added to a neigh->arp_queue while waiting for an arp reply. Where original skb's skb->dev can be different to neigh's neigh->dev. For instance in case of bridging dnated skb from one veth to another, the skb would be added to a neigh->arp_queue of the bridge. As skb->dev can be reset back to nf_bridge->physindev and used, and as there is no explicit mechanism that prevents this physindev from been freed under us (for instance neigh_flush_dev doesn't cleanup skbs from different device's neigh queue) we can crash on e.g. this stack: arp_process neigh_update skb = __skb_dequeue(&neigh->arp_queue) neigh_resolve_output(..., skb) ... br_nf_dev_xmit br_nf_pre_routing_finish_bridge_slow skb->dev = nf_bridge->physindev br_handle_frame_finish Let's use plain ifindex instead of net_device link. To peek into the original net_device we will use dev_get_by_index_rcu(). Thus either we get device and are safe to use it or we don't get it and drop skb.
References
Impacted products
Vendor Product Version
Linux Linux Version: c4e70a87d975d1f561a00abfe2d3cefa2a486c95
Version: c4e70a87d975d1f561a00abfe2d3cefa2a486c95
Version: c4e70a87d975d1f561a00abfe2d3cefa2a486c95
Version: c4e70a87d975d1f561a00abfe2d3cefa2a486c95
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      "id": "CVE-2024-35839",
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      "published": "2024-05-17T15:15:21.017",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-35839\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-17T15:15:21.017\",\"lastModified\":\"2024-11-21T09:21:01.073\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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\"},{\"url\":\"https://git.kernel.org/stable/c/544add1f1cfb78c3dfa3e6edcf4668f6be5e730c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/9325e3188a9cf3f69fc6f32af59844bbc5b90547\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/9874808878d9eed407e3977fd11fee49de1e1d86\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
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      "dataVersion": "5.1"
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}