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Echo: linux: security update to 6.1.140-1

medium Tenable Self-Hosted Container Security Plugin ID 463734

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: sch_htb: make htb_deactivate()
 idempotent Alan reported a NULL pointer dereference in htb_next_rb_node() after we made htb_qlen_notify()
 idempotent. It turns out in the following case it introduced some regression: htb_dequeue_tree(): |->
 fq_codel_dequeue() |-> qdisc_tree_reduce_backlog() |-> htb_qlen_notify() |-> htb_deactivate() |->
 htb_next_rb_node() |-> htb_deactivate() For htb_next_rb_node(), after calling the 1st htb_deactivate(),
 the clprio[prio]->ptr could be already set to NULL, which means htb_next_rb_node() is vulnerable here. For
 htb_deactivate(), although we checked qlen before calling it, in case of qlen==0 after
 qdisc_tree_reduce_backlog(), we may call it again which triggers the warning inside. To fix the issues
 here, we need to: 1) Make htb_deactivate() idempotent, that is, simply return if we already call it
 before. 2) Make htb_next_rb_node() safe against ptr==NULL. Many thanks to Alan for testing and for the
 reproducer. (CVE-2025-37953)

Solution

Update the linux library and its related packages to version 6.1.140-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-37953

Plugin Details

Severity: Medium

ID: 463734

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

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-2025-37953

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: 9/15/2025

Vulnerability Publication Date: 5/20/2025

Reference Information

CVE: CVE-2025-37953