{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47084"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhamradio: defer ax25 kfree after unregister_netdev\n\nThere is a possible race condition (use-after-free) like below\n\n (USE)                       |  (FREE)\nax25_sendmsg                 |\n ax25_queue_xmit             |\n  dev_queue_xmit             |\n   __dev_queue_xmit          |\n    __dev_xmit_skb           |\n     sch_direct_xmit         | ...\n      xmit_one               |\n       netdev_start_xmit     | tty_ldisc_kill\n        __netdev_start_xmit  |  mkiss_close\n         ax_xmit             |   kfree\n          ax_encaps          |\n                             |\n\nEven though there are two synchronization primitives before the kfree:\n1. wait_for_completion(\u0026ax-\u003edead). This can prevent the race with\nroutines from mkiss_ioctl. However, it cannot stop the routine coming\nfrom upper layer, i.e., the ax25_sendmsg.\n\n2. netif_stop_queue(ax-\u003edev). It seems that this line of code aims to\nhalt the transmit queue but it fails to stop the routine that already\nbeing xmit.\n\nThis patch reorder the kfree after the unregister_netdev to avoid the\npossible UAF as the unregister_netdev() is well synchronized and won\u0027t\nreturn if there is a running routine.",
      "id": "GSD-2021-47084",
      "modified": "2024-03-01T06:04:48.318188Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2021-47084",
        "STATE": "REJECT"
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "** REJECT ** This CVE ID has been rejected or withdrawn by its CVE Numbering Authority."
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority."
          }
        ],
        "id": "CVE-2021-47084",
        "lastModified": "2024-03-19T14:15:07.540",
        "metrics": {},
        "published": "2024-03-04T18:15:07.253",
        "references": [],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Rejected"
      }
    }
  }
}