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 20198.0.0

high Tenable Cloud Security Plugin ID 475616

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: md: wait for behind writes before
destroying bitmap __md_stop() destroyed the bitmap before calling mddev_detach(). That made mddev_detach()
skip bitmap_ops->wait_behind_writes(), because the bitmap was already disconnected from mddev. This was
still safe for the legacy bitmap because bitmap_destroy() waits for behind writes itself. llbitmap keeps
that wait in its ->wait_behind_writes() operation instead, while ->destroy() tears down the llbitmap
storage. With the old ordering, RAID1 behind-write completions could still run after llbitmap storage had
been freed. Call mddev_detach() before md_bitmap_destroy() so the common detach path can wait for behind
writes while the bitmap is still alive. Only destroy the bitmap after those users are gone.
(CVE-2026-90278)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 20198.0.0 or later.

Plugin Details

Severity: High

ID: 475616

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: 58.37

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-90278

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: 9/17/2026

Reference Information

CVE: CVE-2026-90278

Detections

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