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

critical Tenable Self-Hosted Container Security Plugin ID 472695

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/raid10: fix still_degraded being
inverted in raid10_sync_request() Commit fe6a19d40ceb ("md/md-bitmap: merge md_bitmap_start_sync() into
bitmap_operations") converted still_degraded from int to bool, but inverted the assignment in the loop
that checks whether the array will still be degraded after the current device is recovered:
"still_degraded = 1" became "still_degraded = false". As a result, recovering a device while another
mirror is still missing calls md_bitmap_start_sync() with degraded == false, which clears bitmap bits that
the still-missing device needs. When that device is re-added, its bitmap-based recovery finds the bits
already cleared and skips every region written while the array was degraded, so it is marked In_sync while
holding stale data: silent corruption. Reproducer (raid10 near=2, 4 disks, internal bitmap): - fail and
remove one disk of each mirror pair - write to the degraded array - re-add both disks and let recovery
finish - "check" reports mismatch_cnt=262272 after 256 MiB of degraded writes and file contents differ;
the second disk's "recovery" completes in milliseconds because everything is skipped The same conversion
in raid1 got it right (still_degraded = true). Restore the correct value. (CVE-2026-89558)

Solution

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

Plugin Details

Severity: Critical

ID: 472695

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: Medium

Score: 4.9

Percentile: 58.22

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-2026-89558

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/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: 9/11/2026

Reference Information

CVE: CVE-2026-89558

Detections

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