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 19907.0.0

high Tenable Self-Hosted Container Security Plugin ID 470833

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: memcg: use round-robin victim
selection in refill_stock Harry Yoo reported that get_random_u32_below() is not safe to call in the nmi
context and memcg charge draining can happen in nmi context. More specifically get_random_u32_below() is
neither reentrant- nor NMI-safe: it acquires a per-cpu local_lock via local_lock_irqsave() on the
batched_entropy_u32 state. An NMI that lands on a CPU mid-update of the ChaCha batch state and recurses
into the random subsystem would corrupt that state. The memcg_stock local_trylock prevents re-entry on the
percpu stock itself, but cannot protect an unrelated subsystem's per-cpu lock. Replace the random pick
with a per-cpu round-robin counter stored in memcg_stock_pcp and serialized by the same local_trylock that
already guards cached[] and nr_pages[]. No atomics, no random calls, no extra locks needed.
(CVE-2026-53162)

Solution

Update the sys-kernel/cchost-kernel-6_18 library and its related packages to version 19907.0.0 or later.

Plugin Details

Severity: High

ID: 470833

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: Medium

Score: 4.9

Percentile: 58.07

Vendor

Vendor Severity: HIGH

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-53162

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: 6/25/2026

Reference Information

CVE: CVE-2026-53162

Detections

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