Google: sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_18: security update to 20098.0.0

high Tenable Cloud Security Plugin ID 471411

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: bpf: Fix use-after-free in offloaded
map/prog info fill When querying info for an offloaded BPF map or program, bpf_map_offload_info_fill_ns()
and bpf_prog_offload_info_fill_ns() obtain the network namespace with get_net(dev_net(offmap->netdev)).
However, the associated netdev's netns may be racing with teardown during netns destruction. If the netns
refcount has already reached 0, get_net() performs a refcount_t increment on 0, triggering: refcount_t:
addition on 0; use-after-free. Although rtnl_lock and bpf_devs_lock ensure the netdev pointer remains
valid, they cannot prevent the netns refcount from reaching zero. Fix this by using maybe_get_net()
instead of get_net(). maybe_get_net() uses refcount_inc_not_zero() and returns NULL if the refcount is
already zero, which causes ns_get_path_cb() to fail and the caller to return -ENOENT -- the correct
behavior when the netns is being destroyed. (CVE-2026-53089)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20098.0.0 or later.

Plugin Details

Severity: High

ID: 471411

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: 58.27

Vendor

Vendor Severity: HIGH

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-2026-53089

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: 6/24/2026

Reference Information

CVE: CVE-2026-53089

Detections

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