{"id":"CVE-2021-47397","details":"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  \u003cIRQ\u003e\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","modified":"2026-03-15T14:09:21.758411Z","published":"2024-05-21T15:15:25.017Z","related":["SUSE-SU-2024:1979-1","SUSE-SU-2024:1983-1","SUSE-SU-2024:2008-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2184-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b"},{"type":"FIX","url":"https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124"},{"type":"FIX","url":"https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1"},{"type":"FIX","url":"https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"4.8"},{"fixed":"4.14.249"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.209"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.151"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.71"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.14.10"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc3"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47397.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}