CVE-2024-49978

{"id": "CVE-2024-49978", "cveTags": [], "metrics": {}, "published": "2024-10-21T18:15:18.483", "references": [{"url": "https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659df", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daa", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Awaiting Analysis", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngso: fix udp gso fraglist segmentation after pull from frag_list\n\nDetect gso fraglist skbs with corrupted geometry (see below) and\npass these to skb_segment instead of skb_segment_list, as the first\ncan segment them correctly.\n\nValid SKB_GSO_FRAGLIST skbs\n- consist of two or more segments\n- the head_skb holds the protocol headers plus first gso_size\n- one or more frag_list skbs hold exactly one segment\n- all but the last must be gso_size\n\nOptional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can\nmodify these skbs, breaking these invariants.\n\nIn extreme cases they pull all data into skb linear. For UDP, this\ncauses a NULL ptr deref in __udpv4_gso_segment_list_csum at\nudp_hdr(seg->next)->dest.\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon't just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gso: arregla la segmentaci\u00f3n de fraglist gso udp despu\u00e9s de extraer de frag_list Detecta skbs de fraglist gso con geometr\u00eda corrupta (ver abajo) y p\u00e1salos a skb_segment en lugar de a skb_segment_list, ya que el primero puede segmentarlos correctamente. Skbs SKB_GSO_FRAGLIST v\u00e1lidos: consisten en dos o m\u00e1s segmentos: el head_skb contiene los encabezados de protocolo m\u00e1s el primero gso_size: uno o m\u00e1s skbs de frag_list contienen exactamente un segmento: todos menos el \u00faltimo deben ser gso_size Los ganchos de ruta de datos opcionales como NAT y BPF (bpf_skb_pull_data) pueden modificar estos skbs, rompiendo estos invariantes. En casos extremos, extraen todos los datos en skb lineal. Para UDP, esto provoca un desreferenciado de ptr NULL en __udpv4_gso_segment_list_csum en udp_hdr(seg->next)->dest. Detecta geometr\u00eda no v\u00e1lida debido a la extracci\u00f3n, verificando el tama\u00f1o de head_skb. No la elimines, ya que esto puede convertir un destino en un agujero negro. Convierte para poder pasar a skb_segment normal."}], "lastModified": "2024-10-23T15:13:25.583", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}