Detections
Analytics

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

medium Tenable Cloud Security Plugin ID 475776

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: bootconfig: Fix integer overflow in
 initrd size check Sashiko reported that in get_boot_config_from_initrd(), a crafted initrd with a huge
 bootconfig size (such as 0xFFFFFFFF) can cause the pointer arithmetic: data = ((void *)hdr) - size; to
 wrap around on 32-bit systems (or when pointer subtraction overflows). Because data wraps around, the
 subsequent bounds check: if ((unsigned long)data < initrd_start) evaluates to false, bypassing the check.
 The kernel then calls xbc_calc_checksum(data, size), which attempts to read 4GB of memory, hitting
 unmapped pages and triggering a fatal kernel page fault during early boot. Furthermore, on 64-bit systems
 with an initrd > 4.29 GB, an unbounded 32-bit size can similarly bypass the initrd_start check. Fix this
 by: 1. Ensuring the initrd is at least large enough to contain the bootconfig footer and verifying hdr is
 within the initrd bounds. 2. Checking that size does not exceed XBC_DATA_MAX and does not exceed the
 available space between initrd_start and hdr before performing pointer subtraction. (CVE-2026-97906)

Solution

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

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-138.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 475776

Version: Revision 1.1

Type: Local

Published: 10/16/2026

Updated: 10/16/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.6

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 4.9

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

CVSS Score Source: CVE-2026-97906

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: 9/25/2026

Reference Information

CVE: CVE-2026-97906