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Echo: linux: security update to 6.1.187-1

high Tenable Self-Hosted Container Security Plugin ID 458509

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_objref: validate objref
 and objrefmap expressions Referencing a synproxy stateful object from OUTPUT hook causes kernel crash due
 to infinite recursive calls: BUG: TASK stack guard page was hit at 000000008bda5b8c (stack is
 000000003ab1c4a5..00000000494d8b12) [...] Call Trace: __find_rr_leaf+0x99/0x230
 fib6_table_lookup+0x13b/0x2d0 ip6_pol_route+0xa4/0x400 fib6_rule_lookup+0x156/0x240
 ip6_route_output_flags+0xc6/0x150 __nf_ip6_route+0x23/0x50 synproxy_send_tcp_ipv6+0x106/0x200
 synproxy_send_client_synack_ipv6+0x1aa/0x1f0 nft_synproxy_do_eval+0x263/0x310 nft_do_chain+0x5a8/0x5f0
 [nf_tables nft_do_chain_inet+0x98/0x110 nf_hook_slow+0x43/0xc0 __ip6_local_out+0xf0/0x170
 ip6_local_out+0x17/0x70 synproxy_send_tcp_ipv6+0x1a2/0x200 synproxy_send_client_synack_ipv6+0x1aa/0x1f0
 [...] Implement objref and objrefmap expression validate functions. Currently, only NFT_OBJECT_SYNPROXY
 object type requires validation. This will also handle a jump to a chain using a synproxy object from the
 OUTPUT hook. Now when trying to reference a synproxy object in the OUTPUT hook, nft will produce the
 following error: synproxy_crash.nft: Error: Could not process rule: Operation not supported synproxy name
 mysynproxy ^^^^^^^^^^^^^^^^^^^^^^^^ (CVE-2025-40206)

Solution

Update the linux library and its related packages to version 6.1.187-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-40206

Plugin Details

Severity: High

ID: 458509

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.12

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2025-40206

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: 11/13/2025

Vulnerability Publication Date: 11/12/2025

Reference Information

CVE: CVE-2025-40206