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Echo: linux: security update to 6.1.170-1

high Tenable Cloud Security Plugin ID 465747

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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.
 (CVE-2025-68206)

Solution

Update the linux library and its related packages to version 6.1.170-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-68206

Plugin Details

Severity: High

ID: 465747

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.43

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-68206

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 12/16/2025

Vulnerability Publication Date: 12/16/2025

Reference Information

CVE: CVE-2025-68206