{
  "cveId": "CVE-2021-47397",
  "url": "https://patchblox.com/security/cve/CVE-2021-47397",
  "summary": "CVE-2021-47397 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47397, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sctp: break out if skb_header_pointer returns NU...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb  We should always check if skb_header_pointer\u0027s return is NULL before using it, otherwise it may cause null-ptr-deref, as syzbot reported:    KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]   RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [inline]   RIP: 0010:sctp_rcv\u002B0x1d84/0x3220 net/sctp/input.c:196   Call Trace:   \u003CIRQ\u003E    sctp6_rcv\u002B0x38/0x60 net/sctp/ipv6.c:1109    ip6_protocol_deliver_rcu\u002B0x2e9/0x1ca0 net/ipv6/ip6_input.c:422    ip6_input_finish\u002B0x62/0x170 net/ipv6/ip6_input.c:463    NF_HOOK include/linux/netfilter.h:307 [inline]    NF_HOOK include/linux/netfilter.h:301 [inline]    ip6_input\u002B0x9c/0xd0 net/ipv6/ip6_input.c:472    dst_input include/net/dst.h:460 [inline]    ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]    NF_HOOK include/linux/netfilter.h:307 [inline]    NF_HOOK include/linux/netfilter.h:301 [inline]    ipv6_rcv\u002B0x28c/0x3c0 net/ipv6/ip6_input.c:297",
  "published": "2024-05-21T15:15:25Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00776,
  "epssPercentile": 0.56017,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.12-1",
      "fix": "DEBIAN-CVE-2021-47397",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47397",
      "released": "2024-05-21T15:15:25Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.12-1",
      "fix": "DEBIAN-CVE-2021-47397",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47397",
      "released": "2024-05-21T15:15:25Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.12-1",
      "fix": "DEBIAN-CVE-2021-47397",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47397",
      "released": "2024-05-21T15:15:25Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}