{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46244",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46244"
  ],
  "published": "2026-06-03T15:43:02Z",
  "summary": "netfilter: nft_inner: Fix IPv6 inner_thoff desync",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_inner: Fix IPv6 inner_thoff desync\n\nIn nft_inner_parse_l2l3(), when processing inner IPv6 packets,\nipv6_find_hdr() correctly computes the transport header offset\ntraversing all extension headers, but the result is immediately\noverwritten with nhoff + sizeof(_ip6h) (40 bytes), which only\naccounts for the IPv6 base header. This creates a desync between\ninner_thoff (wrong \u2014 points to extension header start) and l4proto\n(correct \u2014 e.g., IPPROTO_TCP), enabling transport header forgery\nand potential firewall bypass. This issue affects stable versions\nfrom Linux 6.2.\n\nFor comparison, the normal (non-inner) IPv6 path correctly\npreserves ipv6_find_hdr()'s result. Removing the incorrect overwrite\nensures that ipv6_find_hdr()'s calculated transport header offset is\npreserved, thereby fixing the desynchronization.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46244"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "scenario": "AV:N - Exploitation is triggered when a remote attacker sends crafted tunneled packets (GRE/Geneve/VXLAN/UDP/TCP) that are evaluated on netfilter ingress/forward hooks, not via netlink rule installation.\nAC:L - The attacker fully controls packet layout including inner IPv6 extension headers and can reliably desynchronize inner_thoff from the real transport header without races or rare layout conditions.\nPR:N - The attacker needs no privileges on the victim; only pre-existing nftables rules using the inner expression must be present, which is victim infrastructure rather than attacker privilege.\nUI:N - No victim user action is required beyond normal network traffic processing once vulnerable firewall rules exist.\nS:U - Impact is bypass of host netfilter policy within the kernel network security boundary, not VM escape, container breakout, or crossing a separate hardware/IOMMU authority.\nC:H - Bypassing inner-header filtering can expose confidential services and data on protected internal networks that the firewall was meant to block from the attacker\u2019s network position.\nI:H - The desync allows forged inner transport matches so traffic can be misclassified, defeating integrity of nftables filtering decisions and permitting unauthorized flows.\nA:N - The bug misdirects skb_copy_bits reads within attacker-supplied packet data and yields NFT_BREAK on failure; it does not corrupt kernel memory or cause panics/oops."
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}