{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53218",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53218"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "netfilter: nft_exthdr: fix register tracking for F_PRESENT flag",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_exthdr: fix register tracking for F_PRESENT flag\n\nnft_exthdr_init() passes user-controlled priv->len to\nnft_parse_register_store(), which marks that many bytes in the\nregister bitmap as initialized.  However, when NFT_EXTHDR_F_PRESENT\nis set, the eval paths write only 1 byte (nft_reg_store8) or\n4 bytes (*dest = 0 on TCP/DCCP error path).  When len > 4,\nregisters beyond the first are never written, retaining\nuninitialized stack data from nft_regs.\n\nBail out if userspace requests too much data when F_PRESENT is set.",
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