{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-47397",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47397",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-21T15:03:53.431Z",
    "updatedAt": "2026-08-05T08:47:38.908Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb",
      "summary": "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",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "77bc7dcf0fcc1519341a91788d7a2914fcfddf6d"
            },
            {
              "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8c630a7b4f9dec63f08bd881ab77984a724a5124"
            },
            {
              "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1"
            },
            {
              "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9c6591ae8e63f93c895ad5e2703c36c548aac997"
            },
            {
              "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8180611c238e11676612eb2a9828b1c7a3a4d77b"
            },
            {
              "version": "3acb50c18d8d6650f10919464ade4dcdaf41d62f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f7e745f8e94492a8ac0b0a26e25f2b19d342918f"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.8",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.8"
            },
            {
              "version": "4.14.249",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.209",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.151",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.71",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.14.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.14.*"
            },
            {
              "version": "5.15",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}