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CVE-2025-68206

netfilter: nft_ct: add seqadj extension for natted connections

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.64, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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 to 192.168.100.1. [..] ftp> epsv EPSV/EPRT on IPv4 off. ftp> ls 227 Entering passive mode (192,168,100,1,209,129). 421 Service not available, remote server has closed connection. Kernel logs: Missing nfct_seqadj_ext_add() setup call WARNING: CPU: 1 PID: 0 at net/netfilter/nf_conntrack_seqadj.c:41 [..] __nf_nat_mangle_tcp_packet+0x100/0x160 [nf_nat] nf_nat_ftp+0x142/0x280 [nf_nat_ftp] help+0x4d1/0x880 [nf_conntrack_ftp] nf_confirm+0x122/0x2e0 [nf_conntrack] nf_hook_slow+0x3c/0xb0 .. Fix this by adding the required extension when a conntrack helper is assigned to a connection that has a nat binding.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 · fixed in 83273af0b60c093ba0085c205864d8542e1b1653; From 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 · fixed in b19492c25eff04852e0cb58f9bb8238b6695ed2d; From 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 · fixed in 4de80f0dc3868408dd7fe9817e507123c9dd8bb0; From 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 · fixed in b477ef7fa612fa45b6b3134d90d1eeb09396500a; From 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 · fixed in 4ab2cd906e4e1a19ddbda6eb532851b0e9cda110; From 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 · fixed in 2b52d89cbbb0dbe3e948d8d9a91e704316dccfe6; From 1a64edf54f55d7956cf5a0d95898bc1f84f9b818 · fixed in 90918e3b6404c2a37837b8f11692471b4c512de2

  • Linux Linux

    4.12

  • KernelLinux

    From 4.12.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.64; From 6.13.0 · fixed in 6.17.9

References 7

git.kernel.org