Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6: security update to 18613.339.70

medium Tenable Self-Hosted Container Security Plugin ID 473398

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: netfilter: ctnetlink: fix refcount
leak on table dump There is a reference count leak in ctnetlink_dump_table(): if (res < 0) {
nf_conntrack_get(&ct->ct_general); // HERE cb->args[1] = (unsigned long)ct; ... While its very unlikely,
its possible that ct == last. If this happens, then the refcount of ct was already incremented. This 2nd
increment is never undone. This prevents the conntrack object from being released, which in turn keeps
prevents cnet->count from dropping back to 0. This will then block the netns dismantle (or conntrack
rmmod) as nf_conntrack_cleanup_net_list() will wait forever. This can be reproduced by running
conntrack_resize.sh selftest in a loop. It takes ~20 minutes for me on a preemptible kernel on average
before I see a runaway kworker spinning in nf_conntrack_cleanup_net_list. One fix would to change this to:
if (res < 0) { if (ct != last) nf_conntrack_get(&ct->ct_general); But this reference counting isn't needed
in the first place. We can just store a cookie value instead. A followup patch will do the same for
ctnetlink_exp_dump_table, it looks to me as if this has the same problem and like ctnetlink_dump_table, we
only need a 'skip hint', not the actual object so we can apply the same cookie strategy there as well.
(CVE-2025-38721)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.339.70 or later.

Plugin Details

Severity: Medium

ID: 473398

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/6/2026

Updated: 10/6/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.15

Vendor

Vendor Severity: LOW

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-2025-38721

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

Vulnerability Publication Date: 9/4/2025

Reference Information

CVE: CVE-2025-38721

Detections

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