{
  "id": "CVE-2021-47397",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-05-21T15:15:25.017",
  "lastModified": "2024-05-21T16:54:26.047",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb\n\nWe should always check if skb_header_pointer's return is NULL before\nusing it, otherwise it may cause null-ptr-deref, as syzbot reported:\n\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [inline]\n  RIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input.c:196\n  Call Trace:\n  <IRQ>\n   sctp6_rcv+0x38/0x60 net/sctp/ipv6.c:1109\n   ip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422\n   ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463\n   NF_HOOK include/linux/netfilter.h:307 [inline]\n   NF_HOOK include/linux/netfilter.h:301 [inline]\n   ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472\n   dst_input include/net/dst.h:460 [inline]\n   ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]\n   NF_HOOK include/linux/netfilter.h:307 [inline]\n   NF_HOOK include/linux/netfilter.h:301 [inline]\n   ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: se rompe si skb_header_pointer devuelve NULL en sctp_rcv_ootb. Siempre debemos verificar si el retorno de skb_header_pointer es NULL antes de usarlo; de lo contrario, puede causar null-ptr-deref, como inform\u00f3 syzbot: KASAN : null-ptr-deref en el rango [0x0000000000000000-0x0000000000000007] RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [en l\u00ednea] RIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input .c:196 Seguimiento de llamadas :  sctp6_rcv+0x38/0x60 net/sctp/ipv6.c:1109 ip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422 ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463 incluir/linux /netfilter.h:307 [en l\u00ednea] NF_HOOK include/linux/netfilter.h:301 [en l\u00ednea] ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472 dst_input include/net/dst.h:460 [en l\u00ednea] ip6_rcv_finish net/ipv6/ip6_input.c:76 [en l\u00ednea] NF_HOOK include/linux/netfilter.h:307 [en l\u00ednea] NF_HOOK include/linux/netfilter.h:301 [en l\u00ednea] ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c :297"
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}