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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 457480

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: sctp: purge outqueue on stale COOKIE-
 ECHO handling sctp_stream_update() is only invoked when the association is moved into COOKIE_WAIT during
 association setup/reconfiguration. In this path, the outbound stream scheduler state (stream->out_curr) is
 expected to be clean, since no user data should have been transmitted yet unless the state machine has
 already partially progressed. However, a corner case exists in sctp_sf_do_5_2_6_stale(): when a Stale
 Cookie ERROR is received, the association is rolled back from COOKIE_ECHOED to COOKIE_WAIT. In this
 scenario, user data may already have been queued and even bundled with the COOKIE-ECHO chunk. During the
 rollback, sctp_stream_update() frees the old stream table and installs a new one, but it does not
 invalidate stream->out_curr. As a result, out_curr may still point to a freed sctp_stream_out entry from
 the previous stream state. Later, SCTP scheduler dequeue paths (FCFS, RR, PRIO, etc.) rely on
 stream->out_curr->ext, which can lead to use-after-free once the old stream state has been released via
 sctp_stream_free(). This results in crashes such as (reported by Yuqi): BUG: KASAN: slab-use-after-free in
 sctp_sched_fcfs_dequeue+0x13a/0x140 Read of size 8 at addr ff1100004d4d3208 by task mini_poc/9312 CPU: 1
 UID: 1001 PID: 9312 Comm: mini_poc Not tainted 7.1.0-rc1-00305-gbd3a4795d574 #5 PREEMPT(full)
 sctp_sched_fcfs_dequeue+0x13a/0x140 sctp_outq_flush+0x1603/0x33e0 sctp_do_sm+0x31c9/0x5d30
 sctp_assoc_bh_rcv+0x392/0x6f0 sctp_inq_push+0x1db/0x270 sctp_rcv+0x138d/0x3c10 Fix this by fully purging
 the association outqueue when handling the Stale Cookie case. This ensures all pending transmit and
 retransmit state is dropped, and any scheduler cached pointers are invalidated, making it safe to rebuild
 stream state during COOKIE_WAIT restart. Updating only stream->out_curr would be insufficient, since
 queued and retransmittable data would still reference the old stream state and trigger later use-after-
 free in dequeue paths. (CVE-2026-52924)

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-2026-52924

Plugin Details

Severity: High

ID: 457480

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.19

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-52924

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/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: 6/24/2026

Reference Information

CVE: CVE-2026-52924