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Echo: linux: security update to 6.12.85-1

high Tenable Cloud Security Plugin ID 455399

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: bridge: cfm: Fix race condition in
 peer_mep deletion When a peer MEP is being deleted, cancel_delayed_work_sync() is called on ccm_rx_dwork
 before freeing. However, br_cfm_frame_rx() runs in softirq context under rcu_read_lock (without RTNL) and
 can re-schedule ccm_rx_dwork via ccm_rx_timer_start() between cancel_delayed_work_sync() returning and
 kfree_rcu() being called. The following is a simple race scenario: cpu0 cpu1 mep_delete_implementation()
 cancel_delayed_work_sync(ccm_rx_dwork); br_cfm_frame_rx() // peer_mep still in hlist if
 (peer_mep->ccm_defect) ccm_rx_timer_start() queue_delayed_work(ccm_rx_dwork)
 hlist_del_rcu(&peer_mep->head); kfree_rcu(peer_mep, rcu); ccm_rx_work_expired() // on freed peer_mep To
 prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync() in both peer MEP
 deletion paths, so that subsequent queue_delayed_work() calls from br_cfm_frame_rx() are silently
 rejected. The cc_peer_disable() helper retains cancel_delayed_work_sync() because it is also used for the
 CC enable/disable toggle path where the work must remain re-schedulable. (CVE-2026-23393)

Solution

Update the linux library and its related packages to version 6.12.85-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-23393

Plugin Details

Severity: High

ID: 455399

Version: Revision 1.2

Type: Local

Published: 10/1/2026

Updated: 10/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.96

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-2026-23393

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: 5/1/2026

Vulnerability Publication Date: 3/25/2026

Reference Information

CVE: CVE-2026-23393