{
  "cveId": "CVE-2026-98851",
  "url": "https://patchblox.com/security/cve/CVE-2026-98851",
  "summary": "CVE-2026-98851 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-98851, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "netfilter: nft_flow_offload: drop flowtable reference on init error path",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  netfilter: nft_flow_offload: drop flowtable reference on init error path  nft_flow_offload_init() bumps the flowtable use count with nft_use_inc() before calling nf_ct_netns_get().  When the latter fails, the error is returned as-is and the reference is leaked.  The upper layers do not balance it either: nf_tables_newexpr() clears expr-\u003Eops when the expression init callback fails, so the nft_expr_more() iteration in nft_rule_expr_deactivate() and nf_tables_rule_destroy() stops right before the failed expression and its -\u003Edestroy callback, which would drop the reference, never runs.  Each failed rule addition therefore leaks one flowtable reference and the flowtable can no longer be removed: NFT_MSG_DELFLOWTABLE keeps reporting -EBUSY even though no rule references it.  Save the nf_ct_netns_get() return value and undo the nft_use_inc() when it fails, restoring the inc/dec pairing within nft_flow_offload_init() itself.",
  "published": "2026-10-18T16:17:39Z",
  "severity": "Low",
  "cvss": 2.3,
  "epss": 0.00208,
  "epssPercentile": 0.11028,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98851",
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  "noFixYet": [],
  "dataAsOf": "2026-11-11T01:43:54Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}