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Echo: linux: security update to 6.1.176-1

medium Tenable Self-Hosted Container Security Plugin ID 459169

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: net: add proper RCU protection to
 /proc/net/ptype Yin Fengwei reported an RCU stall in ptype_seq_show() and provided a patch. Real issue is
 that ptype_seq_next() and ptype_seq_show() violate RCU rules. ptype_seq_show() runs under rcu_read_lock(),
 and reads pt->dev to get device name without any barrier. At the same time, concurrent writers can remove
 a packet_type structure (which is correctly freed after an RCU grace period) and clear pt->dev without an
 RCU grace period. Define ptype_iter_state to carry a dev pointer along seq_net_private: struct
 ptype_iter_state { struct seq_net_private p; struct net_device *dev; // added in this patch }; We need to
 record the device pointer in ptype_get_idx() and ptype_seq_next() so that ptype_seq_show() is safe against
 concurrent pt->dev changes. We also need to add full RCU protection in ptype_seq_next(). (Missing
 READ_ONCE() when reading list.next values) Many thanks to Dong Chenchen for providing a repro.
 (CVE-2026-23255)

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-2026-23255

Plugin Details

Severity: Medium

ID: 459169

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.45

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-2026-23255

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: 5/1/2026

Vulnerability Publication Date: 3/18/2026

Reference Information

CVE: CVE-2026-23255