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 19216.700.7

high Tenable Cloud Security Plugin ID 469468

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/raid5: round bitmap stripes with
sector division raid5_bitmap_sector_map() aligns the array range to full RAID5 stripe widths before
converting it to component sectors. That width is chunk_sectors multiplied by the number of data disks,
and it is not always a power of two. Reproduce with a 4-disk RAID5, 1024-sector chunks, and three data
disks. The full-stripe width is 3072 sectors. For a one-sector write at array sector 3072, correct
rounding gives array range [3072, 6144), which maps to component range [1024, 2048). The old
round_down()/round_up() logic instead gives [1024, 4096), which maps to [0, 1024). Use sector_div() based
arithmetic so the rounded range is aligned to the actual RAID5 stripe width. The deterministic mapper test
now reports the fixed component range as [1024, 2048), while the old mask-based range was [0, 1024).
(CVE-2026-90279)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19216.700.7 or later.

Plugin Details

Severity: High

ID: 469468

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: 58.27

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-90279

CVSS v3

Risk Factor: High

Base Score: 8.4

Temporal Score: 7.3

Vector: CVSS:3.0/AV:L/AC:L/PR:N/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-2026-90279

Detections

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