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 19506.505.8

medium Tenable Self-Hosted Container Security Plugin ID 472714

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: jbd2: bound shrinker scans by examined
checkpoint buffers The jbd2 shrinker currently accounts only checkpoint buffers that it successfully
releases against nr_to_scan. Busy buffers therefore do not consume the scan budget. If a checkpoint
transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding
journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs
spinning on j_list_lock, causing soft lockups or RCU stalls. Pass nr_to_scan into
journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL
from checkpoint cleanup paths so their existing full-list behavior is preserved. This restores the scan-
budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete
checkpoint list. (CVE-2026-89567)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.505.8 or later.

Plugin Details

Severity: Medium

ID: 472714

Version: Revision 1.3

Type: Local

Family: Google COS Security Checks

Published: 10/5/2026

Updated: 10/6/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.66

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-89567

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: 9/11/2026

Reference Information

CVE: CVE-2026-89567

Detections

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