Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_12: security update to 19738.0.0

high Tenable Cloud Security Plugin ID 470801

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: keys: Fix UAF in key_put() Once a
key's reference count has been reduced to 0, the garbage collector thread may destroy it at any time and
so key_put() is not allowed to touch the key after that point. The most key_put() is normally allowed to
do is to touch key_gc_work as that's a static global variable. However, in an effort to speed up the
reclamation of quota, this is now done in key_put() once the key's usage is reduced to 0 - but now the
code is looking at the key after the deadline, which is forbidden. Fix this by using a flag to indicate
that a key can be gc'd now rather than looking at the key's refcount in the garbage collector.
(CVE-2025-21893)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19738.0.0 or later.

Plugin Details

Severity: High

ID: 470801

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: 57.12

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-2025-21893

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: 3/31/2025

Reference Information

CVE: CVE-2025-21893

Detections

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