CVE-2026-46244 (GCVE-0-2026-46244)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:48 – Updated: 2026-06-03 15:48
VLAI
Title
netfilter: nft_inner: Fix IPv6 inner_thoff desync
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: Fix IPv6 inner_thoff desync In nft_inner_parse_l2l3(), when processing inner IPv6 packets, ipv6_find_hdr() correctly computes the transport header offset traversing all extension headers, but the result is immediately overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only accounts for the IPv6 base header. This creates a desync between inner_thoff (wrong — points to extension header start) and l4proto (correct — e.g., IPPROTO_TCP), enabling transport header forgery and potential firewall bypass. This issue affects stable versions from Linux 6.2. For comparison, the normal (non-inner) IPv6 path correctly preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite ensures that ipv6_find_hdr()'s calculated transport header offset is preserved, thereby fixing the desynchronization.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < c161ad9157f5a0429b5ff94d9770faf3bf48d273 (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 870d59e2cf218e7418491e26bad768cb16654582 (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 689bbf48c1f45130086ae1c46ab83ea4c753c601 (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < b6a91f68ebfed9c38e0e9150f58a9b85da07181c (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_inner.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "value": "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()\u0027s result. Removing the incorrect overwrite\nensures that ipv6_find_hdr()\u0027s calculated transport header offset is\npreserved, thereby fixing the desynchronization."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-03T15:48:59.049Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273"
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          "url": "https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601"
        },
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          "url": "https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce"
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        {
          "url": "https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c"
        }
      ],
      "title": "netfilter: nft_inner: Fix IPv6 inner_thoff desync",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46244",
    "datePublished": "2026-06-03T15:48:59.049Z",
    "dateReserved": "2026-05-13T15:03:33.107Z",
    "dateUpdated": "2026-06-03T15:48:59.049Z",
    "state": "PUBLISHED"
  },
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  }
}


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