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netfilter: nft_ct: add seqadj extension for natted connections

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: add seqadj extension for natted connections Sequence adjustment may be required for FTP traffic with PASV/EPSV modes. due to need to re-write packet payload (IP, port) on the ftp control connection. This can require changes to the TCP length and expected seq / ack_seq. The easiest way to reproduce this issue is with PASV mode. Example ruleset: table inet ftp_nat { ct helper ftp_helper { type "ftp" protocol tcp l3proto inet } chain prerouting { type filter hook prerouting priority 0; policy accept; tcp dport 21 ct state new ct helper set "ftp_helper" } } table ip nat { chain prerouting { type nat hook prerouting priority -100; policy accept; tcp dport 21 dnat ip prefix to ip daddr map { 192.168.100.1 : 192.168.13.2/32 } } chain postrouting { type nat hook postrouting priority 100 ; policy accept; tcp sport 21 snat ip prefix to ip saddr map { 192.168.13.2 : 192.168.100.1/32 } } } Note that the ftp helper gets assigned *after* the dnat setup. The inverse (nat after helper assign) is handled by an existing check in nf_nat_setup_info() and will not show the problem. Topoloy: +-------------------+ +----------------------------------+ | FTP: 192.168.13.2 | <-> | NAT: 192.168.13.3, 192.168.100.1 | +-------------------+ +----------------------------------+ | +-----------------------+ | Client: 192.168.100.2 | +-----------------------+ ftp nat changes do not work as expected in this case: Connected t

Announced Group revision 1
Original source ↗

CVE-2025-68206

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-68206

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1a64edf54f55d7956cf5a0d95898bc1f84f9b818",
        "lessThan": "83273af0b60c093ba0085c205864d8542e1b1653",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a64edf54f55d7956cf5a0d95898bc1f84f9b818",
        "lessThan": "b19492c25eff04852e0cb58f9bb8238b6695ed2d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a64edf54f55d7956cf5a0d95898bc1f84f9b818",
        "lessThan": "4de80f0dc3868408dd7fe9817e507123c9dd8bb0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a64edf54f55d7956cf5a0d95898bc1f84f9b818",
        "lessThan": "b477ef7fa612fa45b6b3134d90d1eeb09396500a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a64edf54f55d7956cf5a0d95898bc1f84f9b818",
        "lessThan": "4ab2cd906e4e1a19ddbda6eb532851b0e9cda110",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a64edf54f55d7956cf5a0d95898bc1f84f9b818",
        "lessThan": "2b52d89cbbb0dbe3e948d8d9a91e704316dccfe6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a64edf54f55d7956cf5a0d95898bc1f84f9b818",
        "lessThan": "90918e3b6404c2a37837b8f11692471b4c512de2",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_ct.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.12",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.64",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_ct.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-68206

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30727 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2025-68206 · Revision 1Source updated