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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 463395

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: allow subflow rcv wnd to shrink
 In MPTCP connection, the `window` field in the TCP header refers to the MPTCP-level rcv_nxt and it's right
 edge should not move backward. Such constraint is enforced at DSS option generation time. At the same
 time, the TCP stack ensures independently that the TCP-level rcv wnd right's edge does not move backward.
 That in turn causes artificial inflating of the MPTCP rcv window when the incoming data is acked at the
 TCP level and is OoO in the MPTCP sequence space (or lands in the backlog). As a consequence, the incoming
 traffic can exceed the receiver rcvbuf size even when the sender is not misbehaving. Prevent such scenario
 forcibly allowing the TCP subflow to shrink the TCP-level rcv wnd regardless of the current netns setting.
 (CVE-2026-53183)

Solution

Update the linux library and its related packages to version 6.1.176-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-53183

Plugin Details

Severity: High

ID: 463395

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.63

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-2026-53183

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: 6/25/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-53183