Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_6: security update to 19216.220.57

medium Tenable Self-Hosted Container Security Plugin ID 472028

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: apparmor: fix differential encoding
verification Differential encoding allows loops to be created if it is abused. To prevent this the unpack
should verify that a diff-encode chain terminates. Unfortunately the differential encode verification had
two bugs. 1. it conflated states that had gone through check and already been marked, with states that
were currently being checked and marked. This means that loops in the current chain being verified are
treated as a chain that has already been verified. 2. the order bailout on already checked states compared
current chain check iterators j,k instead of using the outer loop iterator i. Meaning a step backwards in
states in the current chain verification was being mistaken for moving to an already verified state. Move
to a double mark scheme where already verified states get a different mark, than the current chain being
kept. This enables us to also drop the backwards verification check that was the cause of the second error
as any already verified state is already marked. (CVE-2026-23409)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.220.57 or later.

Plugin Details

Severity: Medium

ID: 472028

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.74

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-2026-23409

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: 4/1/2026

Reference Information

CVE: CVE-2026-23409

Detections

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