Google: sys-kernel/cchost-kernel-6_12, sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_12, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_12, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_12, sys-kernel/lakitu-nc-kernel-6_18: security update to 19804.0.0

medium Tenable Self-Hosted Container Security Plugin ID 470780

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: KVM: arm64: Fix pin leak and
publication ordering in __pkvm_init_vcpu() Two bugs exist in the vCPU initialisation path: 1. If a check
fails after hyp_pin_shared_mem() succeeds, the cleanup path jumps to 'unlock' without calling
unpin_host_vcpu() or unpin_host_sve_state(), permanently leaking pin references on the host vCPU and SVE
state pages. Extract a register_hyp_vcpu() helper that performs the checks and the store. When
register_hyp_vcpu() returns an error, call unpin_host_vcpu() and unpin_host_sve_state() inline before
falling through to the existing 'unlock' label. 2. register_hyp_vcpu() publishes the new vCPU pointer into
'hyp_vm->vcpus[]' with a bare store, allowing a concurrent caller of pkvm_load_hyp_vcpu() to observe a
partially initialised vCPU object. Ensure the store uses smp_store_release() and the load uses
smp_load_acquire(). While 'vm_table_lock' currently serialises the store and the load, these barriers
ensure the reader sees the fully initialised 'hyp_vcpu' object even if there were a lockless path or if
the lock's own ordering guarantees were insufficient for nested object initialization. (CVE-2026-46147)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19804.0.0 or later.

Plugin Details

Severity: Medium

ID: 470780

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: Low

Score: 3

Percentile: 23.63

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-2026-46147

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: 5/26/2026

Reference Information

CVE: CVE-2026-46147

Detections

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