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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 457821

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: Bluetooth: RFCOMM: hold listener
 socket in rfcomm_connect_ind() rfcomm_get_sock_by_channel() scans rfcomm_sk_list under the list lock, but
 returns the selected listener after dropping that lock without taking a reference. rfcomm_connect_ind()
 then locks the listener, queues a child socket on it, and may notify it after unlocking it. The buggy
 scenario involves two paths, with each column showing the order within that path: rfcomm_connect_ind():
 listener close: 1. Find parent in 1. close() enters rfcomm_get_sock_by_channel() rfcomm_sock_release(). 2.
 Drop rfcomm_sk_list.lock 2. rfcomm_sock_shutdown() without pinning parent. closes the listener. 3. Call
 lock_sock(parent) and 3. rfcomm_sock_kill() bt_accept_enqueue(parent, unlinks and puts parent. sk, true).
 4. Read parent flags and may 4. parent can be freed. call sk_state_change(). If close wins the race,
 parent can be freed before rfcomm_connect_ind() reaches lock_sock(), bt_accept_enqueue(), or the deferred-
 setup callback. Take a reference on the listener before leaving rfcomm_sk_list.lock. After lock_sock()
 succeeds, recheck that it is still in BT_LISTEN before queueing a child, cache the deferred-setup bit
 while the parent is locked, and drop the reference after the last parent use. KASAN reported a slab-use-
 after-free in lock_sock_nested() from rfcomm_connect_ind(), with the freeing stack going through
 rfcomm_sock_kill() and rfcomm_sock_release(). (CVE-2026-53256)

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-2026-53256

Plugin Details

Severity: High

ID: 457821

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.13

CVSS v2

Risk Factor: High

Base Score: 7.7

Temporal Score: 5.7

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

CVSS Score Source: CVE-2026-53256

CVSS v3

Risk Factor: High

Base Score: 8

Temporal Score: 7

Vector: CVSS:3.0/AV:A/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: 6/25/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-53256