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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 460352

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: tcp: call sk_data_ready() after
 listener migration When inet_csk_listen_stop() migrates an established child socket from a closing
 listener to another socket in the same SO_REUSEPORT group, the target listener gets a new accept-queue
 entry via inet_csk_reqsk_queue_add(), but that path never notifies the target listener's waiters. A
 nonblocking accept() still works because it checks the queue directly, but poll()/epoll_wait() waiters and
 blocking accept() callers can also remain asleep indefinitely. Call READ_ONCE(nsk->sk_data_ready)(nsk)
 after a successful migration in inet_csk_listen_stop(). However, after inet_csk_reqsk_queue_add()
 succeeds, the ref acquired in reuseport_migrate_sock() is effectively transferred to nreq->rsk_listener.
 Another CPU can then dequeue nreq via accept() or listener shutdown, hit reqsk_put(), and drop that
 listener ref. Since listeners are SOCK_RCU_FREE, wrap the post-queue_add() dereferences of nsk in
 rcu_read_lock()/rcu_read_unlock(), which also covers the existing sock_net(nsk) access in that path. The
 reqsk_timer_handler() path does not need the same changes for two reasons: half-open requests become
 readable only after the final ACK, where tcp_child_process() already wakes the listener; and once nreq is
 visible via inet_ehash_insert(), the success path no longer touches nsk directly. (CVE-2026-46015)

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-2026-46015

Plugin Details

Severity: High

ID: 460352

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.17

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-2026-46015

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: 5/28/2026

Vulnerability Publication Date: 5/26/2026

Reference Information

CVE: CVE-2026-46015