302 lines
15 KiB
JSON
302 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveId": "CVE-2021-47397",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-21T14:58:30.815Z",
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"datePublished": "2024-05-21T15:03:53.431Z",
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"dateUpdated": "2026-08-05T08:47:38.908Z"
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},
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{
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"lang": "en",
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"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"
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:N - The bug is in sctp_rcv_ootb(), reached from sctp4_rcv/sctp6_rcv on the IPPROTO_SCTP receive path when processing out-of-the-blue packets; a remote peer can deliver crafted SCTP packets over IPv4/IPv6 with no local socket required beyond the SCTP stack being loaded.\nAC:L - The attacker only needs to send crafted SCTP packets that fail association lookup and enter the OOTB walker; there is no race, victim-side state, or other condition outside the attacker’s control required to hit the unchecked skb_header_pointer() result.\nPR:N - OOTB handling runs for packets that match no association, falls back to the per-net ctl_sock endpoint, and requires no authentication or privileges on the target.\nUI:N - Exploitation requires only sending network packets; no user action such as opening a file or establishing an application session is needed.\nS:U - Impact is confined to the vulnerable host’s kernel (crash/DoS); this does not cross a VM, IOMMU, or other security authority boundary.\nC:N - The defect is a pure NULL pointer dereference of skb_header_pointer()’s return value when reading ch->length; it does not disclose kernel memory.\nI:N - There is no write, type confusion, or other memory corruption primitive—only a NULL deref—so integrity cannot be compromised beyond the crash itself.\nA:H - Dereferencing the NULL chunk header pointer causes a kernel oops/general protection fault in softirq/IRQ receive context, which is a full availability impact and can be repeated with further packets."
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}
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"role": "CISA Coordinator",
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