{
  "cveId": "CVE-2021-47507",
  "url": "https://patchblox.com/security/cve/CVE-2021-47507",
  "summary": "CVE-2021-47507 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47507, released May 24, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nfsd: Fix nsfd startup race (again)  Commit bd5a...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: Fix nsfd startup race (again)  Commit bd5ae9288d64 (\u0022nfsd: register pernet ops last, unregister first\u0022) has re-opened rpc_pipefs_event() race against nfsd_net_id registration (register_pernet_subsys()) which has been fixed by commit bb7ffbf29e76 (\u0022nfsd: fix nsfd startup race triggering BUG_ON\u0022).  Restore the order of register_pernet_subsys() vs register_cld_notifier(). Add WARN_ON() to prevent a future regression.  Crash info: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000012 CPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1 pc : rpc_pipefs_event\u002B0x54/0x120 [nfsd] lr : rpc_pipefs_event\u002B0x48/0x120 [nfsd] Call trace:  rpc_pipefs_event\u002B0x54/0x120 [nfsd]  blocking_notifier_call_chain  rpc_fill_super  get_tree_keyed  rpc_fs_get_tree  vfs_get_tree  do_mount  ksys_mount  __arm64_sys_mount  el0_svc_handler  el0_svc",
  "published": "2024-05-24T15:15:11Z",
  "severity": "medium",
  "cvss": 4.7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00187,
  "epssPercentile": 0.08329,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47507",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47507",
      "released": "2024-05-24T15:15:11Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47507",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47507",
      "released": "2024-05-24T15:15:11Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47507",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47507",
      "released": "2024-05-24T15:15:11Z"
    }
  ],
  "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"
  }
}