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Echo: linux: security update to 6.1.159-1

medium Tenable Cloud Security Plugin ID 464292

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: mptcp: Fix proto fallback detection
 with BPF The sockmap feature allows bpf syscall from userspace, or based on bpf sockops, replacing the
 sk_prot of sockets during protocol stack processing with sockmap's custom read/write interfaces. '''
 tcp_rcv_state_process() syn_recv_sock()/subflow_syn_recv_sock()
 tcp_init_transfer(BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB) bpf_skops_established <== sockops
 bpf_sock_map_update(sk) <== call bpf helper tcp_bpf_update_proto() <== update sk_prot ''' When the server
 has MPTCP enabled but the client sends a TCP SYN without MPTCP, subflow_syn_recv_sock() performs a
 fallback on the subflow, replacing the subflow sk's sk_prot with the native sk_prot. '''
 subflow_syn_recv_sock() subflow_ulp_fallback() subflow_drop_ctx() mptcp_subflow_ops_undo_override() '''
 Then, this subflow can be normally used by sockmap, which replaces the native sk_prot with sockmap's
 custom sk_prot. The issue occurs when the user executes
 accept::mptcp_stream_accept::mptcp_fallback_tcp_ops(). Here, it uses sk->sk_prot to compare with the
 native sk_prot, but this is incorrect when sockmap is used, as we may incorrectly set sk->sk_socket->ops.
 This fix uses the more generic sk_family for the comparison instead. Additionally, this also prevents a
 WARNING from occurring: result from ./scripts/decode_stacktrace.sh: ------------[ cut here ]------------
 WARNING: CPU: 0 PID: 337 at net/mptcp/protocol.c:68 mptcp_stream_accept \ (net/mptcp/protocol.c:4005)
 Modules linked in: ... PKRU: 55555554 Call Trace: <TASK> do_accept (net/socket.c:1989) __sys_accept4
 (net/socket.c:2028 net/socket.c:2057) __x64_sys_accept (net/socket.c:2067) x64_sys_call
 (arch/x86/entry/syscall_64.c:41) do_syscall_64 (arch/x86/entry/syscall_64.c:63
 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) RIP:
 0033:0x7f87ac92b83d ---[ end trace 0000000000000000 ]--- (CVE-2025-68227)

Solution

Update the linux library and its related packages to version 6.1.159-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-68227

Plugin Details

Severity: Medium

ID: 464292

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2025-68227

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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: 12/17/2025

Vulnerability Publication Date: 12/9/2025

Reference Information

CVE: CVE-2025-68227