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 20162.0.0

high Tenable Self-Hosted Container Security Plugin ID 475768

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: sched/core: Make core-sched flips wait
for in-flight selections Core scheduling's pick_next_task() operates on all sibling rqs under one
acquisition of the shared core-wide lock. A ->pick_task() that releases the rq lock leaves every sibling
__lock momentarily free, letting __sched_core_flip(false) complete mid-selection and rebind rq_lockp()
under it. The selection resumes on the split locks, touching sibling state it no longer protects, and
__schedule() finally releases a lock that was never taken while leaking the one that was. Count in-flight
core-wide selections in the leader's rq->core_pick_in_flight and make __sched_core_flip() wait for the
count to drain. The count only changes under the shared lock, which the flip holds while sampling, so no
other ordering is needed. The wait can repeat while selections overlap, but the flip backs off between
samples and flips are rare cookie-lifetime events. sched_core_cpu_deactivate() moves the count to the new
leader - a stale copy left behind would bias it forever if that CPU later returns as its own leader.
(CVE-2026-89520)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20162.0.0 or later.

Plugin Details

Severity: High

ID: 475768

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.42

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-2026-89520

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: 9/11/2026

Reference Information

CVE: CVE-2026-89520

Detections

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