Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6: security update to 19216.395.138

high Tenable Self-Hosted Container Security Plugin ID 468713

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: ensure safe
access to master conntrack Holding reference on the expectation is not sufficient, the master conntrack
object can just go away, making exp->master invalid. To access exp->master safely: - Grab the
nf_conntrack_expect_lock, this gets serialized with clean_from_lists() which also holds this lock when the
master conntrack goes away. - Hold reference on master conntrack via nf_conntrack_find_get(). Not so easy
since the master tuple to look up for the master conntrack is not available in the existing problematic
paths. This patch goes for extending the nf_conntrack_expect_lock section to address this issue for
simplicity, in the cases that are described below this is just slightly extending the lock section. The
add expectation command already holds a reference to the master conntrack from ctnetlink_create_expect().
However, the delete expectation command needs to grab the spinlock before looking up for the expectation.
Expand the existing spinlock section to address this to cover the expectation lookup. Note that, the
nf_ct_expect_iterate_net() calls already grabs the spinlock while iterating over the expectation table,
which is correct. The get expectation command needs to grab the spinlock to ensure master conntrack does
not go away. This also expands the existing spinlock section to cover the expectation lookup too. I needed
to move the netlink skb allocation out of the spinlock to keep it GFP_KERNEL. For the expectation events,
the IPEXP_DESTROY event is already delivered under the spinlock, just move the delivery of IPEXP_NEW under
the spinlock too because the master conntrack event cache is reached through exp->master. While at it, add
lockdep notations to help identify what codepaths need to grab the spinlock. (CVE-2026-43116)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.395.138 or later.

Plugin Details

Severity: High

ID: 468713

Version: Revision 1.6

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/6/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.96

Vendor

Vendor Severity: LOW

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-2026-43116

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

Vulnerability Publication Date: 5/6/2026

Reference Information

CVE: CVE-2026-43116

Detections

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