{
  "cveId": "CVE-2021-47068",
  "url": "https://patchblox.com/security/cve/CVE-2021-47068",
  "summary": "CVE-2021-47068 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47068, released February 29, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net/nfc: fix use-after-free llcp_sock_bind/conne...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/nfc: fix use-after-free llcp_sock_bind/connect  Commits 8a4cd82d (\u0022nfc: fix refcount leak in llcp_sock_connect()\u0022) and c33b1cc62 (\u0022nfc: fix refcount leak in llcp_sock_bind()\u0022) fixed a refcount leak bug in bind/connect but introduced a use-after-free if the same local is assigned to 2 different sockets.  This can be triggered by the following simple program:     int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );     int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );     memset( \u0026addr, 0, sizeof(struct sockaddr_nfc_llcp) );     addr.sa_family = AF_NFC;     addr.nfc_protocol = NFC_PROTO_NFC_DEP;     bind( sock1, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )     bind( sock2, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )     close(sock1);     close(sock2);  Fix this by assigning NULL to llcp_sock-\u003Elocal after calling nfc_llcp_local_put.  This addresses CVE-2021-23134.",
  "published": "2024-02-29T23:15:08Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00233,
  "epssPercentile": 0.14203,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-47068",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47068",
      "released": "2024-02-29T23:15:08Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-47068",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47068",
      "released": "2024-02-29T23:15:08Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-47068",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47068",
      "released": "2024-02-29T23:15:08Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}