{
  "cveId": "CVE-2021-47394",
  "url": "https://patchblox.com/security/cve/CVE-2021-47394",
  "summary": "CVE-2021-47394 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47394, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  netfilter: nf_tables: unlink table before deleti...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  netfilter: nf_tables: unlink table before deleting it  syzbot reports following UAF: BUG: KASAN: use-after-free in memcmp\u002B0x18f/0x1c0 lib/string.c:955  nla_strcmp\u002B0xf2/0x130 lib/nlattr.c:836  nft_table_lookup.part.0\u002B0x1a2/0x460 net/netfilter/nf_tables_api.c:570  nft_table_lookup net/netfilter/nf_tables_api.c:4064 [inline]  nf_tables_getset\u002B0x1b3/0x860 net/netfilter/nf_tables_api.c:4064  nfnetlink_rcv_msg\u002B0x659/0x13f0 net/netfilter/nfnetlink.c:285  netlink_rcv_skb\u002B0x153/0x420 net/netlink/af_netlink.c:2504  Problem is that all get operations are lockless, so the commit_mutex held by nft_rcv_nl_event() isn\u0027t enough to stop a parallel GET request from doing read-accesses to the table object even after synchronize_rcu().  To avoid this, unlink the table first and store the table objects in on-stack scratch space.",
  "published": "2024-05-21T15:15:24Z",
  "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": 0.00235,
  "epssPercentile": 0.14486,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.12-1",
      "fix": "DEBIAN-CVE-2021-47394",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47394",
      "released": "2024-05-21T15:15:24Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.12-1",
      "fix": "DEBIAN-CVE-2021-47394",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47394",
      "released": "2024-05-21T15:15:24Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.12-1",
      "fix": "DEBIAN-CVE-2021-47394",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47394",
      "released": "2024-05-21T15:15:24Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}