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 19506.224.7

medium Tenable Cloud Security Plugin ID 470164

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: mm/userfaultfd: fix hugetlb fault
mutex hash calculation In mfill_atomic_hugetlb(), linear_page_index() is used to calculate the page index
for hugetlb_fault_mutex_hash(). However, linear_page_index() returns the index in PAGE_SIZE units, while
hugetlb_fault_mutex_hash() expects the index in huge page units. This mismatch means that different
addresses within the same huge page can produce different hash values, leading to the use of different
mutexes for the same huge page. This can cause races between faulting threads, which can corrupt the
reservation map and trigger the BUG_ON in resv_map_release(). Fix this by introducing
hugetlb_linear_page_index(), which returns the page index in huge page granularity, and using it in place
of linear_page_index(). (CVE-2026-31575)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.224.7 or later.

Plugin Details

Severity: Medium

ID: 470164

Version: Revision 1.5

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: Low

Score: 3

Percentile: 23.65

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-31575

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: 4/24/2026

Reference Information

CVE: CVE-2026-31575

Detections

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